Visual Inspection of the Fuel Nozzle [PW11]

TASK 73-11-09-210-801-A
Visual Inspection of the Fuel Nozzle

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

1. Reason for the Job
Self explanatory
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	MAGNIFYING GLASS POWER 10X

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-134)	Dry Developer
(Material No.P05-421)	Scrub Pad

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-804-A	SPOP 208 - Degreasing of Parts by Solvent Wiping
TASK 70-28-00-910-802-A	SPOP 533 - Blending and Buffing of Steel, Nickel, Cobalt, Aluminum and Magnesium Alloy Components
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 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
Visual Inspection of the Fuel Nozzle

3. Job Set-up
Subtask 73-11-09-941-052-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 73-11-09-010-057-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 73-11-09-040-052-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 73-11-09-010-058-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

CAUTION: PUT CAPS OR PLUGS IN ALL OPENINGS AS NECESSARY TO MAKE SURE THAT CHIPS, DUST OR OTHER FOREIGN MATERIAL DO NOT GO INTO THE FUEL PASSAGES. IF YOU DO NOT OBEY THIS INSTRUCTION, INTERNAL DAMAGE OR BLOCKAGE CAN OCCUR.

NOTE: The checks must be done in a clean area free from dirt, grit, and moisture.

NOTE: Make sure that the fuel nozzle engine flight hours are less than the designated service life according to the maintenance planning guide or operators approved maintenance plan. If service life is met or exceeded, return the fuel nozzle to vendor cage code 65065 for overhaul. Refer to the operators approved maintenance plan. Clean the fuel nozzles before the visual examination.

Subtask 73-11-09-210-050-A ** ON A/C NOT FOR ALL

A. Do a visual examination of the fuel nozzles.
(1) Examine the fuel nozzles for burn through or other gross deformities or damage.
(a) If any burn through or other gross deformities or damage is observed, do not continue. Return the parts to vendor cage code 65065.
(2) Use a MAGNIFYING GLASS POWER 10X to do the examinations of the fuel nozzle.
(3) Do visual examination of the heat shield area as follows. See the sheet 1 and 2 of the figure:

Visual Inspection of the Fuel Nozzle ** ON A/C NOT FOR ALL

(a) Examine the heat shield and fuel nozzle support weld area. Check the heat shield for burns and looseness.
1 No burns or looseness is permitted.
(b) Examine the assembly for scoring, cracks, breaks, corrosion, distortion and other obvious signs of damage.
1 No cracks, corrosion or tears are permitted. Handling and surface damage (nicks, dents, raised material etc.) are permitted with the limits that follow:
a Examine the heat shield for dents, dings or scratches. Round-bottomed dents or dings up to 0.02 in. (0.51 mm) deep or 0.25 in. (6.35 mm) long are permitted. Reject the fuel nozzle if the damage is more than 0.02 in. (0.51 mm) deep or 0.25 in. (6.35 mm) long.
b Scratches up to 0.005 in. (0.13 mm) deep are permitted. Reject the fuel nozzle if the damage is more than 0.005 in. (0.13 mm).
c Dents, dings or scratches that have raised material or sharp corners are not permitted. Reject the fuel nozzle if the dents, dings or scratches have raised material or sharp corners. Contact Pratt & Whitney if questionable material is found.
(4) Do a visual examination of the fuel inlet fittings area as follows. See the sheets 1, 2 and 3 of the figure:

Visual Inspection of the Fuel Nozzle ** ON A/C NOT FOR ALL

(a) Examine the fuel inlet fittings and the filter screens located inside each fitting.
(b) For the inlet filter inspections use visual aids (such as dental mirror, pen light, borescope and video scope) and magnification if necessary.
(c) Use the working distance that gives the best light intensity and the best image focus at the same time.
(d) Examine the flat surface filter screen.
1 No more than 25 percent of the flat surface filter screen is permitted to be blocked by materials.
2 If more than 25 percent of the flat surface filter screen is blocked by materials, reject the fuel nozzle.
(e) Examine the flat bottom surface of the cup shaped filter assembly on the secondary system.
1 No more than 50 percent of the flat bottom surface can be blocked by materials.
2 If more than 50 percent of the flat bottom surface is blocked by materials or if the material has sufficient depth to cover more than 50 percent of the side walls of the filter, reject the fuel nozzle.
(f) Examine the threads on the inlet fittings for damage.

CAUTION: PUT BLANKING PLUGS ON ALL THE OPENINGS BEFORE YOU DO A REPAIR TO MAKE SURE THAT DUST DOES NOT GO INTO THE FUEL PASSAGES. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EQUIPMENT CAN OCCUR.

1 Do a visual check of the threads:
a If more than 25 percent of a thread is damaged, reject the fuel nozzle.
b If a thread has damage in more than one location, reject the fuel nozzle.
2 Examine the threads in areas 0, 1 and 2 and examine the inlet chamfer as follows:
a Remove raised metal with repair-09 but only use fine stone material.
b It is permissible to polish minor surface damage to make it smooth with only a Scrub Pad (Material No.P05-421) per SPOP 533 (Ref. AMM TASK 70-28-00-910-802).
c Chase the threads.

NOTE: The minimum length of the thread is 0.425 in. (10.795 mm).

d Wipe the area with a clean Dry Developer (Material No.P05-134) or clean the area per SPOP 208 (Ref. AMM TASK 70-27-00-910-804).
e For starting threads (area 0), it is permissible to blend indications smooth per SPOP 533 (Ref. AMM TASK 70-28-00-910-802).

Maintain a minimum minor diameter.

3 Check the threads with go-no-go thread gages.
4 If the thread length is greater than 0.425 in. (10.795 mm), inspect the indications on the threads and inlet chamfer as follows:
a Area 0, inlet chamfer and starting threads:

Examine the inlet chamfer as follows:
* If the indication is greater than 0.005 in. (0.127 mm) in maximum depth, reject the fuel nozzle.
* If the indication is less than 0.005 in. (0.127 mm) in maximum depth, inspect the fuel nozzle for cracks.

NOTE: No cracks are permitted.

Examine the starting threads as follows:
* If the minor diameter is less than 0.554 in. (14.072 mm), reject the fuel nozzle.

b Area 1, starting threads to 0.375 in. (9.525 mm) from the end of the fitting:

Examine the major thread diameter as follows:
* If the indications are greater than 0.010 in. (0.254 mm) in radial depth, reject the fuel nozzle.
* If the indications are greater than 0.100 in. (2.540 mm) in circumferential length, reject the fuel nozzle.
* If all the indications on each fitting are greater than 0.500 in. (12.700 mm) in total circumferential length, reject the fuel nozzle.
Examine the threads from 0.010 in. (0.254 mm) radially inward from the major diameter to the thread root area as follows:
* If the indications are greater than 0.001 in. (0.025 mm) in depth, reject the fuel nozzle.

c Area 2, threads greater than 0.375 in. (9.525 mm) to the end:

Examine the major thread diameter as follows:
* If the indications are greater than 0.020 in. (0.508 mm) in radial depth, reject the fuel nozzle.
* If the indication depths are between 0.010 in. (0.254 mm) and 0.020 in. (0.508 mm), they must be smooth and continuous with the surrounding surfaces.
* If the indications are not smooth and continuous, reject the fuel nozzle.
* Indications less than 0.010 in. (0.254 mm) are permitted.
Examine the threads from 0.020 in. (0.508 mm) radially inward from the thread major diameter to the thread root as follows:
* If the indication is greater than 0.001 in. (0.025 mm) in depth, reject the fuel nozzle.

(g) Examine the conical seat of the inlet fittings.
1 Radial scratches on the conical seat that extend more than half the width of the conical sealing surface are not permitted.
2 If radial scratches that extend more than half the width of the conical sealing surface are found, repair the fuel nozzle. Contact Pratt & Whitney.
(h) Examine the conical sealing surface for circumferential marks.
1 No circumferential marks more than 0.001 in. (0.03 mm) deep are permitted.

NOTE: Scratches or marks more than 0.001 in. (0.03 mm) deep on the counter-bore diameter sealing surface cannot be repaired.

(i) Examine the counter-bore diameter sealing surface for damage.
1 Scratches or marks more than 0.001 in. (0.03 mm) deep are not permitted.
2 If scratches or marks more than 0.001 in. (0.03 mm) deep are found, reject the fuel nozzle.
(j) The inlet fitting sealing surfaces must be free from all defects such as tool marks and handling damage.
1 No raised surfaces or linear indications are permitted.
(5) Do a visual examination of the flange mounting surface area as follows. See the sheet 1 and 2 of the figure:

Visual Inspection of the Fuel Nozzle ** ON A/C NOT FOR ALL

(a) Examine the surface finish of the flange mounting surface.
1 No defects such as tool marks or handling damage are permitted.
(b) Examine the mounting flange sealing surface for nicks, pits, scratches, galling and wear.
1 No nicks, pits, scratches, galling and wear more than 0.005 in. (0.13 mm) deep are permitted.
(c) Examine the mounting flange sealing surface for raised surfaces and linear indications.
1 No raised surfaces or linear indications more than 0.005 in. (0.13 mm) are permitted.
(6) Do a visual examination of the exit orifice and tip area as follows. See the sheet 1 and 2 of the figure:

Visual Inspection of the Fuel Nozzle ** ON A/C NOT FOR ALL

(a) Examine the nozzle exit for carbon and gum deposits.
1 No build up or deposits near the orifices are permitted.
(b) Examine the exit orifice for burns.
1 No burns are permitted. If burns are found, reject the fuel nozzle.
2 Discoloration is permitted.
(7) Do a visual examination of the support radius area as follows. See the sheet 1 and 2 of the figure:

Visual Inspection of the Fuel Nozzle ** ON A/C NOT FOR ALL

(a) Use a MAGNIFYING GLASS POWER 10X to examine the support radius area for nicks, pits and scratches.
1 No nicks, pits and scratches more than 0.005 in. (0.13 mm) deep are permitted.
a If any indications more than 0.005 in. (0.13 mm) are found, reject the nozzle.
(b) Examine the support radius area for raised surfaces, sharp corners and linear indications.
1 No raised surfaces, sharp corners or linear indications permitted.
(c) Do a visual examination of the flange locating diameter area as follows:
1 Examine the flange locating diameter area for raised surfaces and linear indications.
a No linear indications more than 0.005 in. (0.13 mm) are permitted. If linear indications more than 0.005 in. (0.13 mm) are found, reject the fuel nozzle.

5. Close-up
Subtask 73-11-09-010-059-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) 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 73-11-09-040-053-A ** ON A/C NOT FOR ALL

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

Subtask 73-11-09-010-060-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.8 from Aug 2017] 2026.04.01 03:02:09 UTC