Removal of the Master Magnetic Chip Detector [CFMB]

TASK 79-21-50-000-001-A
Removal of the Master Magnetic Chip Detector

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.

ZONE: 400
FIN: 4007EN ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
Master Magnetic Chip Detector
General View of the Master Magnetic Chip Detector as Installed on the Lubrication Unit

3. Job Set-up
Subtask 79-21-50-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 79-21-50-010-050-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL, 448AR

4. Procedure
Subtask 79-21-50-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Master Chip Detector.

WARNING: USE PROTECTIVE GLOVES AND BE CAREFUL WITH OIL SPLASHES WHEN YOU DISCONNECT OIL TUBES. HOT OIL CAN CAUSE DEEP BURNS.

CAUTION: BE CAREFUL NOT TO CAUSE CHAFING TO THE HOUSING OF THE MASTER MAGNETIC CHIP DETECTOR WITH THE TOOLS.

(1) Put a CONTAINER 5 L (1.32 USGAL) below the lubrication unit during the removal of the master chip detector.
(2) Disconnect the straight connector (80) from the 90-degrees interface connector.
(a) Put a CAP - BLANKING on the connector (80) and on the open of the 90-degrees interface connector.
(3) Disconnect the hose (10) (hose to the servo-fuel heater) from the master chip detector (40) as follows:
(a) Remove the four bolts (20).

NOTE: The removal of the 4 bolts (20) also releases, the DPM cable items below as a single unit:

The DPM cable integral receptacle and bracket and connected to the receptacle,
The 90-degrees interface connector.
We recommend not to disconnect these items because:
This is not necessary for the completion of the removal steps which follow, and
Their disconnection may cause subsequently some bad electrical contacts.

(b) Move the DPM cable (and its attached items) upwards and attach it, if necessary to keep it clear of the removal area of the master chip detector.
(c) Keep the gasket (30).
(4) Remove the master chip detector (40) from the lubrication unit as follows:
(a) Remove the four bolts (50) and washers (60).
(b) Keep the gasket (70).
(5) Put a CAP - BLANKING and PLUG - BLANKING on all open ends of the master-chip-detector (40), lubrication unit, and hose (10).

[Rev.10 from 2021] 2026.04.01 03:39:24 UTC