Bowed Rotor Special Borescope Inspection of the High Pressure Compressor (HPC) Assembly [PW11]

TASK 72-35-00-290-803-A
Bowed Rotor Special Borescope Inspection of the High Pressure Compressor (HPC) Assembly

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: DO THE BORESCOPE INSPECTION IN AN AREA WHICH HAS PROTECTION FROM THE WEATHER. IF A BORESCOPE INSPECTION IS DONE IN WET CONDITIONS, USE SUFFICIENT PROTECTION TO PREVENT POSSIBLE ELECTRICAL SHOCK TO THE OPERATOR OR DAMAGE TO THE EQUIPMENT. AN ELECTRICAL SHOCK CAN KILL A PERSON OR CAUSE A BAD INJURY.

CAUTION: MAKE SURE THE TEMPERATURE IN THE ENGINE IS LESS THAN 150 DEG.F (65.6 DEG.C) BEFORE YOU INSTALL THE FLEXIBLE BORESCOPE IN THE ENGINE. IF THE ENGINE IS HOTTER THAN 150 DEG.F (65.6 DEG.C), THE FLEXIBLE BORESCOPE CAN MELT AND BE DAMAGED.

CAUTION: WAIT UNTIL THE TEMPERATURE OF THE HPC INTERNAL CAVITY IS LESS THAN 150 DEG.F (65.6 DEG.C) BEFORE YOU REMOVE THE HPC BORESCOPE PLUGS. CASE MISALIGNMENT CAN CAUSE THE HPC BORESCOPE PLUGS TO BREAK AND DAMAGE TO THE HPC CAN OCCUR.

CAUTION: YOU MUST INSTALL THE PROTECTION COVERS ON ALL OPEN BORESCOPE PORTS. IF YOU DO NOT OBEY THIS CAUTION, DEBRIS CAN ENTER THE ENGINE AND CAUSE ENGINE DAMAGE.

ZONE: 400

1. Reason for the Job
Use this inspection procedure to do a special borescope inspection of the High Pressure Compressor (HPC) assembly after a bowed rotor start.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	1	BORESCOPE - FLEXIBLE
No specific	AR	COVER - PROTECTION
No specific	1	THERMOMETER - METAL PROBE TYPE, 0 TO 400 DEG.F
CTE8003	1	SYSTEM BOROSCOPE (VIDEO)
PWA110187	1	KIT CONTROL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-00-00-000-804-A	Removal of the Borescope Plugs
TASK 72-00-00-000-805-A	Removal of the High (N2) Rotor-Turning Equipment
TASK 72-00-00-400-804-A	Installation of the Borescope Plugs
TASK 72-00-00-400-805-A	Installation of the High (N2) Rotor Turning Equipment
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
HPC AP Locations
Vane and Blade Locations
HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips
Visual Reference of Outer Air Seal Rubstrip Conditions
Outer Air Seal Rubstrip Conditions
Borescope Installation and Removal Direction
HPC 8th Stage Rotor
HPC 6th thru 8 Stage Airfoils
Airfoil Tip Wear
Inner Air Seal Rub
HPC 4th thru 7th Stage Stator Inner Rubstrip Inspection
HPC 5th thru 7th Stage Rotor Outer Air Seal Inspection
Airfoil Tip Distress
HPC 5th thru 7th Stage Rotor Convex Airfoil Tip and Airfoil Leading Edge Inspection
HPC 5th Stage IBR Airfoil
HPC 4th Stage IBR Airfoil
HPC 1st thru 4th Stage Rotor Airfoil Leading Edge Inspection
HPC 1st, 2nd and 3rd Stage IBR Airfoil

3. Job Set-up
Subtask 72-35-00-410-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 72-35-00-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

Subtask 72-35-00-400-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Ground maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 72-35-00-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.

4. Procedure
Subtask 72-35-00-290-051-A ** ON A/C NOT FOR ALL

A. Bowed Rotor Special Borescope Inspection of the High Pressure Compressor (HPC) Assembly

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Installation of the protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install the COVER - PROTECTION as necessary to prevent damage to the engine.
(2) If the engine has been operated recently, do a check of the HPC temperature with the THERMOMETER - METAL PROBE TYPE, 0 TO 400 DEG.F.
(a) It is recommended that you wait three to five hours after engine shutdown and that the internal temperature is less than 150 deg.F (65.56 deg.C) before you do a borescope inspection.
(b) As an option, you can dry-motor the engine with the starter to decrease the engine core temperature.
(3) Remove the borescope plug Access Port (AP) HPC-7 and AP HPC-8 (Ref. AMM TASK 72-00-00-000-804).

HPC AP Locations ** ON A/C NOT FOR ALL

and

Vane and Blade Locations ** ON A/C NOT FOR ALL

(4) Install the PWA110187 KIT CONTROL (Ref. AMM TASK 72-00-00-400-805).
(5) The High Pressure Compressor (HPC) integrally bladed rotor airfoil quantities are shown for reference only. See Table 606.
(6) Borescope inspection:

WARNING: BE CAREFUL TO EXAMINE THE POWER CABLE OF THE LIGHT SOURCE BEFORE YOU USE IT. DO NOT USE THE CABLE IF THE INSULATION HAS CUTS OR WORN OR BROKEN AREAS. INSULATION WITH THIS TYPE OF DAMAGE IS DANGEROUS BECAUSE OF POSSIBLE ELECTRICAL SHOCK TO THE OPERATOR.

(a) Do the borescope inspection with the CTE8003 SYSTEM BOROSCOPE (VIDEO).
1 Examine the HPC integrally bladed rotors and rotor blades during the borescope inspections for blend repairs.

NOTE: As an option, the BORESCOPE - FLEXIBLE can be used for all steps.

NOTE: If a blend repair was done before this inspection, it is possible to see an area that is worn more than the permitted damage limits. This area must be examined very carefully to identify if this area is a new defect or an area that was blend-repaired before this inspection procedure. A blend-repaired area will have a minimum five-to-one length-to-depth blend ratio with smooth round corners.

(7) Examination of the HPC through AP HPC-8 as follows:

HPC AP Locations ** ON A/C NOT FOR ALL

and

Vane and Blade Locations ** ON A/C NOT FOR ALL

CAUTION: DAMAGE TO THE BORESCOPE CAN OCCUR IF CAUTION IS NOT USED WHILE ACCESSING AP HPC-8. A 4 MM SCOPE IS REQUIRED BECAUSE OF LIMITED CLEARANCE. USE CAUTION WHEN ROTATING THE ROTOR, THE SCOPE CAN BE DAMAGED WHEN TRAPPED BETWEEN THE BLADES AND INNER CASE OPENING.

(a) Examine the HPC 8th stage integrally bladed rotor airfoil outer air seal rubstrips as follows: refer to Table 607 for the inspection limits and visual reference of the outer air seal rub.

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Visual Reference of Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

1 Put the BORESCOPE - FLEXIBLE through AP HPC-8 and wind counterclockwise (with engine aft looking forward) until the borescope port is in view.

Borescope Installation and Removal Direction ** ON A/C NOT FOR ALL

2 Record a video while you retract the borescope. The borescope must be retracted slowly to get a clear view of the airfoil or rubstrip. The borescope must stay in focus on the outer air seal rubstrip, Leading Edge (LE) airfoil tip and airfoil tip concave side.

HPC 8th Stage Rotor ** ON A/C NOT FOR ALL

(b) Examine the HPC 8th stage integrally bladed rotor airfoil tip convex sides as follows: refer to Table 608 for the inspection limits and visual reference of airfoil tip wear.

HPC 6th thru 8 Stage Airfoils ** ON A/C NOT FOR ALL

Airfoil Tip Wear ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil tip convex side. The image must include the full airfoil chord in the view.

HPC 8th Stage Rotor ** ON A/C NOT FOR ALL

HPC 6th thru 8 Stage Airfoils ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil LE.

HPC 8th Stage Rotor ** ON A/C NOT FOR ALL

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Inner Air Seal Rub ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor arm inner abrasive rubstrip, below the fixed stator. The image must include the full chord of the stator in the view.

HPC 4th thru 7th Stage Stator Inner Rubstrip Inspection ** ON A/C NOT FOR ALL

HPC AP Locations ** ON A/C NOT FOR ALL

and

Vane and Blade Locations ** ON A/C NOT FOR ALL

(a) Examine the HPC 7th stage integrally bladed rotor airfoil outer air seal rubstrips as follows: refer to Table 607 for the inspection limits and visual reference of outer air seal rub.

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Visual Reference of Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

1 Put the BORESCOPE - FLEXIBLE through AP HPC-7 and wind counterclockwise (with engine aft looking forward) until the borescope port is in view.

Borescope Installation and Removal Direction ** ON A/C NOT FOR ALL

2 Record a video while you retract the borescope. The borescope must be retracted slowly to get a clear view of the airfoil or outer air seal rubstrip. The borescope must stay in focus on the outer air seal rubstrip, LE airfoil tip and airfoil tip concave side.

HPC 5th thru 7th Stage Rotor Outer Air Seal Inspection ** ON A/C NOT FOR ALL

(b) Examine the HPC 7th stage integrally bladed rotor airfoil tip convex sides as follows: refer to Table 608 for the inspection limits and visual reference of airfoil tip wear.

HPC 6th thru 8 Stage Airfoils ** ON A/C NOT FOR ALL

Airfoil Tip Wear ** ON A/C NOT FOR ALL

Airfoil Tip Distress ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil tip convex side. The image must include the full airfoil chord in the view.

HPC 5th thru 7th Stage Rotor Convex Airfoil Tip and Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

HPC 6th thru 8 Stage Airfoils ** ON A/C NOT FOR ALL

(c) Examine the HPC 7th stage integrally bladed rotor airfoil LEs as follows: refer to Table 608 for the airfoil LE borescope inspection limits.

HPC 6th thru 8 Stage Airfoils ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil LE.

HPC 5th thru 7th Stage Rotor Convex Airfoil Tip and Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

2 Record a video while you turn the HPC with the borescope inspection kit electric rotator or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or LE while you record the borescope video.
(9) If the borescope inspection limits for the HPC 8th stage integrally bladed rotor airfoil outer air seal rubstrips, HPC 8th stage integrally bladed rotor airfoil tip convex sides, HPC 8th stage integrally bladed rotor airfoil LEs, HPC 7th stage integrally bladed rotor airfoil outer air seal rubstrips, HPC 7th stage integrally bladed rotor airfoil tip convex sides, HPC 7th stage integrally bladed rotor airfoil LE and HPC 7th stage stator inner rubstrips are in the permitted limits, continue to step 4.(A).(19).
(10) If damage is more than the permitted limits, an inspection of the HPC 5th-6th stage integrally bladed rotor airfoil outer air seal rubstrips, HPC 1st-6th stage integrally bladed rotor airfoils and HPC 4th-6th stage stator inner rubstrips is necessary as shown in the steps below.
(11) Remove the borescope plugs AP HPC-1, AP HPC-2, AP HPC-3, AP HPC-4, AP HPC-5 and AP HPC-6 (Ref. AMM TASK 72-00-00-000-804).

HPC AP Locations ** ON A/C NOT FOR ALL

(12) Examine the HPC through AP HPC-7 as follows:

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

(a) Examine the HPC 6th stage stator inner rubstrip as follows: refer to Table 609 for the inspection limits and visual reference of inner air seal rub.

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Inner Air Seal Rub ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor arm inner abrasive rubstrip, below the fixed stator. The image must include the full chord of the stator in the view.

HPC 4th thru 7th Stage Stator Inner Rubstrip Inspection ** ON A/C NOT FOR ALL

HPC AP Locations ** ON A/C NOT FOR ALL

and

Vane and Blade Locations ** ON A/C NOT FOR ALL

(a) Examine the HPC 6th stage integrally bladed rotor airfoil outer air seal rubstrips as follows: refer to Table 607 for the inspection limits and visual reference of outer air seal rub.

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Visual Reference of Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

1 Put the BORESCOPE - FLEXIBLE through AP HPC-6 and wind counterclockwise (with engine aft looking forward) until the borescope port is in view.

Borescope Installation and Removal Direction ** ON A/C NOT FOR ALL

2 Record a video while you retract the borescope. The borescope must be retracted slowly to get a clear view of the airfoil. The borescope must stay in focus on the outer air seal rubstrip, LE airfoil tip and airfoil tip concave side.

HPC 5th thru 7th Stage Rotor Outer Air Seal Inspection ** ON A/C NOT FOR ALL

(b) Examine the HPC 6th stage integrally bladed rotor airfoil tip convex sides as follows: refer to Table 608 for the inspection limits and visual reference of airfoil tip wear.

HPC 6th thru 8 Stage Airfoils ** ON A/C NOT FOR ALL

Airfoil Tip Wear ** ON A/C NOT FOR ALL

Airfoil Tip Distress ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil tip convex side. The image must include the full airfoil chord in the view.

HPC 5th thru 7th Stage Rotor Convex Airfoil Tip and Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

HPC 6th thru 8 Stage Airfoils ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil LE.

HPC 5th thru 7th Stage Rotor Convex Airfoil Tip and Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Inner Air Seal Rub ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor arm inner abrasive rubstrip, below the fixed stator. The image must include the full chord of the stator in the view.

HPC 4th thru 7th Stage Stator Inner Rubstrip Inspection ** ON A/C NOT FOR ALL

HPC AP Locations ** ON A/C NOT FOR ALL

and

Vane and Blade Locations ** ON A/C NOT FOR ALL

(a) Examine the HPC 5th stage integrally bladed rotor airfoil outer air seal rubstrips as follows: refer to Table 607 for the inspection limits and visual reference of outer air seal rub.

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Visual Reference of Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

Outer Air Seal Rubstrip Conditions ** ON A/C NOT FOR ALL

1 Put the BORESCOPE - FLEXIBLE through AP HPC-5 and wind counterclockwise (with engine aft looking forward) until the borescope port is in view.

Borescope Installation and Removal Direction ** ON A/C NOT FOR ALL

HPC 5th thru 7th Stage Rotor Outer Air Seal Inspection ** ON A/C NOT FOR ALL

(b) Examine the HPC 5th stage integrally bladed rotor airfoil tip convex sides as follows: refer to Table 610 for the inspection limits and visual reference of airfoil tip wear.

Airfoil Tip Wear ** ON A/C NOT FOR ALL

Airfoil Tip Distress ** ON A/C NOT FOR ALL

HPC 5th Stage IBR Airfoil ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil tip convex side. The image must include the full airfoil chord in the view.

HPC 5th thru 7th Stage Rotor Convex Airfoil Tip and Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

2 Record a video while you turn the HPC with the borescope inspection kit electric rotor or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or airfoil tip convex side while you record the borescope video.
(c) Examine the HPC 5th stage integrally bladed rotor airfoil LEs as follows: refer to Table 610 for the inspection limits and visual reference of airfoil tip wear.

Airfoil Tip Wear ** ON A/C NOT FOR ALL

Airfoil Tip Distress ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor airfoil LE.

HPC 5th thru 7th Stage Rotor Convex Airfoil Tip and Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

2 Record a video while you turn the HPC with the borescope inspection kit electric rotor or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or airfoil tip convex side while you record the borescope video.
(d) Examine the HPC 4th stage stator inner rubstrips as follows: refer to Table 609 for the inspection limits and visual reference of inner air seal rub.

HPC 1st 8th Stage Airfoil/Blade Outer Rubstrips and HPC 4th through 7th Stage Stator Inner Rubstrips ** ON A/C NOT FOR ALL

Inner Air Seal Rub ** ON A/C NOT FOR ALL

1 Put the borescope probe in a position to view the rotor arm inner abrasive rubstrip, below the fixed stator. The image must include the full stator chord in the view.

HPC 4th thru 7th Stage Stator Inner Rubstrip Inspection ** ON A/C NOT FOR ALL

2 Record a video while you turn the HPC with the borescope inspection kit electric rotor or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or inner rubstrip while you record the borescope video.
(15) Examine the HPC 4th stage integrally bladed rotor airfoil LEs through AP HPC-4 as follows: refer to Table 611 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

HPC 4th Stage IBR Airfoil ** ON A/C NOT FOR ALL

(a) Put the borescope probe in a position to view the rotor airfoil LE.

HPC 1st thru 4th Stage Rotor Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

(b) Record a video while you turn the HPC with the borescope inspection kit electric rotator or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or LE while you record the borescope video.
(16) Examine the HPC 3rd stage for vanes that are not aligned through the AP HPC-4 as follows: refer to Table 613 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

NOTE: A vane that is not aligned is turned along its axis, at a different angle than the adjacent vanes.

(17) Examine the HPC 3rd stage integrally bladed rotor airfoil LEs through AP HPC-3 as follows: refer to Table 612 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

HPC 1st, 2nd and 3rd Stage IBR Airfoil ** ON A/C NOT FOR ALL

(a) Put the borescope probe in a position to view the rotor airfoil LE.

HPC 1st thru 4th Stage Rotor Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

NOTE: You can rotate the variable stage vanes for better access.

(b) Record a video while you turn the HPC with the borescope inspection kit electric rotator or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or LE while you record the borescope video.
(18) Examine the HPC 2nd stage for vanes that are not aligned through AP HPC-3 as follows: refer to Table 613 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

NOTE: A vane that is not aligned is turned along its axis, at a different angle than the adjacent vanes.

(19) Examine the HPC 2nd stage integrally bladed rotor airfoil LEs through AP HPC-2 as follows: refer to Table 612 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

HPC 1st, 2nd and 3rd Stage IBR Airfoil ** ON A/C NOT FOR ALL

(a) Put the borescope probe in a position to view the rotor airfoil LE.

HPC 1st thru 4th Stage Rotor Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

(b) Record a video while you turn the HPC with the borescope inspection kit electric rotator or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or LE while you record the borescope video.
(20) Examine the HPC 1st stage for vanes that are not aligned through AP HPC-2 as follows: refer to Table 613 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

NOTE: A vane that is not aligned is turned along its axis, at a different angle than the adjacent vanes.

(21) Examine the HPC 1st stage integrally bladed rotor airfoil LEs through access point HPC-1 as follows: refer to Table 612 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

HPC 1st, 2nd and 3rd Stage IBR Airfoil ** ON A/C NOT FOR ALL

(a) Put the borescope probe in a position to view the rotor airfoil LE.

HPC 1st thru 4th Stage Rotor Airfoil Leading Edge Inspection ** ON A/C NOT FOR ALL

(b) Record a video while you turn the HPC with the borescope inspection kit electric rotator or a hand wrench at the main gearbox in the counterclockwise direction. The rotor must be turned slowly to get a clear view of the airfoil or LE while you record the borescope video.
(22) Examine the HPC Inlet Guide Vanes (IGVs) for vanes that are not aligned through AP HPC-1 as follows: refer to Table 613 for the inspection limits.

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

NOTE: A vane that is not aligned is turned along its axis, at a different angle than the adjacent vanes.

(23) Remove the PWA110187 KIT CONTROL (Ref. AMM TASK 72-00-00-000-805).

Table 606: HPC Integrally Bladed Rotor Airfoil Quantities

Stage	Quantity
HPC 1st stage integrally bladed rotor airfoil	26
HPC 2nd stage integrally bladed rotor airfoil	38
HPC 3rd stage integrally bladed rotor airfoil	52
HPC 4th stage integrally bladed rotor airfoil	58
HPC 5th stage integrally bladed rotor airfoil	68
HPC 6th stage integrally bladed rotor airfoil	73
HPC 7th stage integrally bladed rotor airfoil	70
HPC 8th stage integrally bladed rotor airfoil	66

Table 607: HPC 5th thru 8th Stage Integrally Bladed Rotor Airfoil Outer Air Seal Rubstrip Borescope Inspection Limits

EXAMINE	DAMAGE	DISPOSITION
1.Outer air seal rubstrip for:
A.Rub and metal smearing	Light rub with depth that can be seen and no metal smearing.	Permitted.
	Rub with light metal smearing onto abradable rubstrip. Transferred metal "islands" do not connect.	Permitted.
	Metal smearing with transferred metal that connects circumferentially.	Contact P&W.
	Metal smearing with transferred metal that connects circumferentially with crack formation.	Contact P&W.
	Smeared metal liberation and pull-out.	Contact P&W.
B.Missing or rubbed out material	A maximum of four areas permitted for a maximum total area of 2.360 in.2 (1522.58 mm2).	Permitted.
	Maximum width of 0.080 in. (2.03 mm) circumferentially and full axial length.	Permitted.
C.Gouging	Abradable gouging and chunk liberation.	Contact P&W.

Table 608: HPC 6th thru 8th Stage Integrally Bladed Rotor Airfoil Borescope Inspection Limits

EXAMINE	DAMAGE	DISPOSITION
1.Integrally bladed rotor airfoil for:
A.Area A (blade tip area with the leading and trailing edges not included) for:
Cracks and tears	All quantities.	Not permitted. Remove the engine from service.
Nicks and dents	All quantities not more than 0.020 in. (0.51 mm) depth.	Permitted.
	All quantities more than 0.020 in. (0.51 mm) to 0.030 in. (0.76 mm) depth.	Permitted for a maximum inspection interval of five flight cycles.
	All quantities more than 0.030 in. (0.76 mm) depth.	Not permitted. Remove the engine from service.
B.Area B (blade tips at leading and trailing edges) for:
Bent or broken corners, missing material, nicks and dents	All quantities not more than 0.0064 in.2 (4.13 mm2).	Permitted.
	All quantities more than 0.0064 in.2 (4.13 mm2).	Not permitted. Remove the engine from service.
Cracks	All quantities.	Not permitted. Remove the engine from service.
C.Area C (blade root radius) for:
Cracks	All quantities.	Not permitted. Remove the engine from service.
Nicks and dents	All quantities.	Not permitted. Remove the engine from service.
D.Area D (blade airfoil LEs with the tip and root radius not included) for:
Cracks and tears	All quantities.	Not permitted. Remove the engine from service.
Nicks and dents	All quantities not more than 0.006 in. (0.15 mm) depth.	Permitted.
	All quantities more than 0.006 in. (0.15 mm) to 0.012 in. (0.30 mm) depth.	Permitted for a maximum inspection interval of five flight cycles.
	All quantities more than 0.012 in. (0.30 mm) depth.	Not permitted. Remove the engine from service.
	Nicks or dents at two or more locations on the LE with 0.080 in. (2.03 mm) or more separation.	Permitted.
	Nicks or dents at two or more locations on the LE with less than 0.080 in. (2.03 mm) separation	Not permitted. Remove the engine from service.
E.Area A and Area B (blade tip area) for:
Damage	Tip wear.	Permitted.
	Abradable transfer from outer air seal to airfoil concave side.	Permitted.
	Discoloration.	Contact P&W.
	Very bad discoloration with burr on airfoil convex side.	Contact P&W.
	Burrs on airfoil convex side.	Contact P&W.

Table 609: HPC 4th thru 7th Stage Stators Inner Rubstrip Borescope Inspection Limits

EXAMINE	DAMAGE	DISPOSITION
1.Inner rubstrip for:
A.Rub and metal smearing	LE rub, not more than 90 degrees (no rub at stator mid-chord or trailing edge).	Permitted.
	LE rub, full circumference (no rub at stator mid-chord or trailing edge).	Permitted.
	Mid-chord rub, full circumference (no rub at trailing edge)	Permitted.
	Full chord rub, 180-degree circumference.	Contact P&W.
	Full chord rub, full circumference.	Contact P&W.
B.Missing or rubbed out material	All quantities not more than 1.00 in.2 (645.16 mm2) in one area and a maximum of 10 percent of the rubstrip area.	Permitted.
	All quantities more than 1.00 in.2 (645.16 mm2) in one area or a total that is more than 10 percent of the rubstrip area.	Contact P&W.

Table 610: HPC 5th Stage Integrally Bladed Rotor Airfoils Borescope Inspection Limits

EXAMINE	DAMAGE	DISPOSITION
1.Integrally bladed rotor airfoil for:
A.Area E (blade tip area with leading and trailing edges not included) for:
Cracks and tears	All quantities.	Not permitted. Remove the engine from service.
Nicks and dents	All quantities not more than 0.020 in. (0.51 mm) depth.	Permitted.
	All quantities more than 0.020 in. (0.51 mm) to 0.030 in. (0.76 mm) depth.	Permitted for a maximum inspection interval of five flight cycles.
	All quantities more than 0.030 in. (0.76 mm) depth	Not permitted. Remove the engine from service.
B.Area F (blade tips at leading and trailing edges) for:
Bent or broken corners, missing material, nicks and dents	All quantities not more than 0.015625 in.2 (10.08 mm2).	Permitted.
Cracks	All quantities more than 0.015625 in.2 (10.08 mm2).	Not permitted. Remove the engine from service.
C.Area G (blade root radius) for:
Cracks	All quantities.	Not permitted. Remove the engine from service.
Nicks and dents	All quantities.	Not permitted. Remove the engine from service.
D.Area H (blade airfoil LEs with tip and root radius not included) for:
Cracks and tears	All quantities.	Not permitted. Remove the engine from service.
Nicks and dents	All quantities not more than 0.010 in. (0.25 mm) depth.	Permitted.
	All quantities more than 0.010 in. (0.25 mm) to 0.020 in. (0.51 mm) depth.	Permitted for a maximum inspection interval of five flight cycles.
	All quantities more than 0.020 in. (0.51 mm) depth.	Not permitted. Remove the engine from service.
	Nicks or dents at two or more locations on the LE with 0.125 in. (3.17 mm) or more separation.	Permitted.
	Nicks or dents at two or more locations on the LE with less than 0.125 in. (3.17 mm) separation.	Not permitted. Remove the engine from service.
E.Area E and Area F (blade tip area) for:
Damage	Tip wear.	Permitted.
	Abradable transfer from outer air seal to airfoil concave side.	Permitted.
	Discoloration.	Contact P&W.
	Very bad discoloration with burr on airfoil convex side.	Contact P&W.
	Burrs on airfoil convex side.	Contact P&W.

Table 611: HPC 4th Stage Integrally Bladed Rotor Airfoils Borescope Inspection Limits

EXAMINE	DAMAGE	DISPOSITION
1.Integrally bladed rotor airfoil for:
A.Area J (blade airfoil LEs with tip and root radius not included) for:
Cracks and tears	All quantities.	Not permitted. Remove the engine from service.
Nick and dents	All quantities not more than 0.010 in. (0.25 mm) depth.	Permitted.
	All quantities more than 0.010 in. (0.25 mm) to 0.020 in. (0.51 mm) depth.	Permitted for a maximum inspection interval of five flight cycles.
	All quantities more than 0.020 in. (0.51 mm) depth.	Not permitted. Remove the engine from service.
	Nicks or dents at two or more locations on the LE with 0.125 in. (3.17 mm) or more separation.	Permitted.
	Nicks or dents at two or more locations on the LE with less than 0.125 in. (3.17 mm) separation.	Not permitted. Remove the engine from service.

Table 612: HPC 1st thru 3rd Stage Integrally Bladed Rotor Airfoils Borescope Inspection Limits

EXAMINE	DAMAGE	DISPOSITION
1.Integrally bladed rotor airfoil for:
A.Area K (blade airfoil LEs with tip and root radius areas not included) for:
Cracks or tears	All quantities.	Not permitted. Remove the engine from service.
Nicks and dents	All quantities not more than 0.015 in. (0.38 mm) depth.	Permitted.
	All quantities more than 0.015 in. (0.38 mm) to 0.030 in. (0.76 mm) depth.	Permitted for a maximum inspection interval of five flight cycles.
	All quantities more than 0.030 in. (0.76 mm) depth.	Not permitted. Remove the engine from service.
	Nicks or dents at two or more locations on the LE with 0.250 in. (6.35 mm) or more separation	Permitted.
	Nicks or dents at two or more locations on the LE with less than 0.250 in. (6.35 mm) separation.	Not permitted. Remove the engine from service.

Table 613: HPC IGVs and 1st, 2nd and 3rd Stage Vanes Borescope Inspection Limits

EXAMINE	DAMAGE	DISPOSITION
1.All IGVs and 1st, 2nd and 3rd stage vanes for:
A.Vanes that are not aligned	Any quantity	Not permitted. Contact Pratt & Whitney.

(24) Install the borescope plugs AP HPC-1, AP HPC-2, AP HPC-3, AP HPC-4, AP HPC-5, AP HPC-6, AP HPC-7 and AP HPC-8 as necessary (Ref. AMM TASK 72-00-00-400-804).

HPC AP Locations ** ON A/C NOT FOR ALL

Vane and Blade Locations ** ON A/C NOT FOR ALL

(25) Make sure that the work area is clean and clear of tools and other items.

5. Close-up
Subtask 72-35-00-860-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Removal of the protection covers

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.

Subtask 72-35-00-440-051-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 72-35-00-410-052-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:49:19 UTC