Visual Inspection of the A, B and C Sumps, the Accessory Gearbox (AGB) and the Transfer Gearbox Sump Scavenge Screen Plugs for Debris [CFML]

TASK 79-00-00-200-806-A
Visual Inspection of the A, B and C Sumps, the Accessory Gearbox (AGB) and the Transfer Gearbox Sump Scavenge Screen Plugs for Debris

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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400

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	MAGNET
No specific	AR	PAPER - THIN
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2010)	white spirit
(Material No.CP2011)	stoddard solvent

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 79-00-00-281-805-A	Analyze Oil Particles
TASK 79-21-05-000-801-A	Removal of the Scavenge Screen Plugs
TASK 79-21-05-400-801-A	Installation of the Scavenge Screen Plugs
TASK 80-11-05-210-801-A	Detailed Inspection of the Air Turbine Starter Magnetic Chip Detector
Visual Inspection of the A, B and C Sumps, AGB and Transfer Gearbox Sumps Scavenge Screen Plugs for Debris

3. Job Set-up
Subtask 79-00-00-941-090-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 79-00-00-010-099-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

4. Procedure
Subtask 79-00-00-869-056-A

A. Preparation
(1) The triple stage scavenge screen plug (4) is assembled with:
(a) The AGB sump (6).
(b) The A sump (3).
(c) The B sump (5).
(2) The double stage scavenge screen plug (9) is assembled with:
(a) The C sump (10).
(b) The transfer gearbox sump (8).

Subtask 79-00-00-210-098-A

B. Visual Inspection of the Scavenge Screen Plugs for Debris

CAUTION: REMOVE AND INSPECT THE SCAVENGE SCREEN PLUGS ONE BY ONE TO BE SURE OF THE ORIGIN OF THE PARTICLES.

CAUTION: TAG THE REMOVED PARTICLES WITH THE RIGHT SUMP NAME TO PREVENT AN ERROR IN THE IDENTIFICATION OF THE MATERIAL SOURCE DURING VISUAL CHARACTERIZATION AND LABORATORY ANALYSIS. A MATERIAL-SOURCE IDENTIFICATION ERROR CAN CAUSE INCORRECT INTERPRETATION OF THE FINDINGS IN RELATION TO THE SERVICEABLE CRITERIA, AND DAMAGE CAN OCCUR.

(1) Remove the triple stage scavenge screen plug (4) and the double stage scavenge screen plug (9) from the lubrication unit (1) (Ref. AMM TASK 79-21-05-000-801).
(2) Visually inspect the O-rings (2) and (7) of each scavenge screen plug.
(a)

Visual Inspection of the A, B and C Sumps, AGB and Transfer Gearbox Sumps Scavenge Screen Plugs for Debris

(b) If there is a piece of O-ring in the lubrication unit lube and scavenge pump scavenge cavity (11), remove and keep it.
(c) Make sure that the piece of O-ring aligns with the cut O-ring.
1 If it aligns, discard it.
2 If it does not align:
a Take pictures of the piece of the O-ring.
b Dimension of the cut O-ring section and estimated radius.
c Analyze the oil particles (Ref. AMM TASK 79-00-00-281-805).

NOTE: If the piece of O-ring is not removed during the inspection of the scavenge screen plug, there is a possibility to have a piece of O-ring left in the lubrication unit lube and scavenge pump scavenge cavity (11). If this piece of O-ring is not removed before scavenge screen plug installation, it will be trapped in the screen during the next engine operation. At the next scavenge screen plug inspection, this piece of O-ring will be found and if the O-ring is not cut during the visual inspection, this will cause confusion and potentially lead to unnecessary actions to troubleshoot the problem.

(3) Visually inspect the triple stage scavenge screen plug (4) and the double stage scavenge screen plug (9) of the lubrication unit (1) for debris.
(4) If you find some magnetic material on the AGB scavenge screen plug, examine the starter magnetic plug for contamination (Ref. AMM TASK 80-11-05-210-801).
(5) If both triple stage scavenge screen plug (4) and the double stage scavenge screen plug (9) are free from debris, do the following steps:
(a) Clean the scavenge screens with the stoddard solvent (Material No.CP2011) .
(b) Make sure that the scavenge screens are free of all particles.
(6) If there are debris particles on either triple stage scavenge screen plug (4) or the double stage scavenge screen plug (9), do the following steps:
(a) Take pictures of the particles on the concerned scavenge screen sump.
(b) Carefully remove the particles from the screens and keep them on the PAPER - THIN.
1 Keep the particles from each sump separate and put them on a separate PAPER - THIN.
(c) Keep the material collected from each scavenge screen separately with the following information attached: ESN, TSC/CSN, source of particles (sump) and removal date.

CAUTION: DO NOT USE A MAGNET WITH TOO MUCH MAGNETIC POWER TO REMOVE THE PARTICLES FROM THE SCAVENGE SCREENS PLUGS. A MAGNET WITH A STRONG MAGNETIC POWER CAN DECREASE THE MAGNETIC PERFORMANCE OF THE MAGNETIC CHIP DETECTOR.

(d) Use the MAGNET to separate the magnetic particles.

NOTE: The characteristics of the magnetic bar retriever with no impact on the scavenge screen plug magnetic field are as follows:

BHmax = 5.5 MGOe (maximum energy product of the magnetic field strength and the magnetic flux density)
Br = 12.8 kG (remanence, the residual magnetism left behind after an external magnetic field is removed)
Hc = 640 Oe (coercivity, the measure of the ability to withstand an external magnetic field without becoming demagnetized).

(e) Remove the oil from the collected particles with the stoddard solvent (Material No.CP2011) or the white spirit (Material No.CP2010) .
(f) Clean the scavenge screens with the stoddard solvent (Material No.CP2011) .
(g) Make sure that the scavenge screens are free of all particles.
(7) Installation of the scavenge screen plugs:

CAUTION: WHEN YOU REPLACE THE O-RING IN EACH SCAVENGE-SCREEN GROOVE LOCATION, MAKE SURE THAT YOU USE THE CORRECT PART NUMBER. THIS IS BECAUSE THE DIMENSIONS OF THE DIFFERENT O-RINGS ARE ALMOST THE SAME. IF YOU DO NOT USE THE CORRECT PART NUMBER, DAMAGE TO THE LUBRICATION UNIT SYSTEM CAN OCCUR.

(a) Install the triple stage scavenge screen plug (4) and the double stage scavenge screen plug (9) in the lubrication unit (1) (Ref. AMM TASK 79-21-05-400-801).
(8) Analyze the oil particles (Ref. AMM TASK 79-00-00-281-805).

5. Close-up
Subtask 79-00-00-410-085-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:42:37 UTC