79-21-10
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 966-023-N00
 (2)  If the MCD probe does not operate correctly, replace the MCD probe (AMM 79-21-10/401).
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MAGNETIC CHIP DETECTOR - CLEANING/PAINTING
__________________________________________
 1.  General_______
 A.  This procedure gives the instructions to clean the magnetic chip detector (MCD).
 B.  There are six MCD's installed in the locations that follow:
 (1)
The drain port on the main gearbox

 (2)
The drain port on the oil tank (master MCD)

 (3)
The housing for the lubrication and scavenge oil pump (4 locations)

 (a)
The scavenge oil inlet for the No. 3 bearing

 (b)
The scavenge oil inlet for the No. 4 bearing

 (c)
The scavenge oil inlet for the angle gearbox

 (d)
The scavenge oil inlet for the No. 1, 1.5, and 2 bearing

 C.  
You can get access to the MCD's through the applicable thrust reverser.

 TASK 79-21-10-107-001-N00
 2.  Clean the Magnetic Chip Detector (Fig. 701)________________________________
 A.  Consumable Materials
 (1)
G00834 Cloth - Cotton, Lint-Free

 (2)
B00722 Solvent - Stoddard, P-D-680 Type II

 B.  
References

 (1)
AMM 79-21-10/401, Magnetic Chip Detector

 (2)
AMM 79-21-10/601, Magnetic Chip Detector

 (3)
IPC 72-61-00 Fig. 10

 (4)
IPC 79-11-01 Fig. 10

 (5)
IPC 79-21-04 Fig. 1

 C.  
Access

 (1)
Location Zones

 412 Engine 1 - Main Gearbox Aft Face 6 o'clock Main Gearbox Fwd Face 6 o'clock Bottom of Oil Tank
 422 Engine 2 - Main Gearbox Aft Face 6 o'clock Main Gearbox Fwd Face 6 o'clock Bottom of Oil Tank
 432 Engine 3 - Main Gearbox Aft Face 6 o'clock Main Gearbox Fwd Face 6 o'clock Bottom of Oil Tank
 442  Engine 4 - Main Gearbox Aft Face 6 o'clock Main Gearbox Fwd Face 6 o'clock Bottom of Oil Tank
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
ANGLE GEARBOX 
MAGNETIC 
CHIP DETECTOR 
SEE  D 
NO. 3 BEARING 
MAGNETIC  NO. 4 BEARING  NO. 1,1.5, AND 2 
CHIP DETECTOR  MAGNETIC  BEARING MAGNETIC 
MAGNETIC CHIP  SEE  D  CHIP DETECTOR  CHIP DETECTOR 
DETECTORS  SEE  D  SEE  D 
SEE  A  B 

MAIN 
GEARBOX 
INTEGRATED DRIVE GENERATOR (REF)  SCAVENGE OIL PUMP LUBRICATION AND  (REF) 
FWD 
A 

FWD  (REF) GEARBOX MAIN  B  DSEE MAGNETIC CHIP DETECTOR MAIN GEARBOX 
Figure 701 (Sheet 1) Magnetic Chip Detector Cleaning 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE C
MAIN  OIL TANK 
GEARBOX MASTER MAGNETIC 
(REF)  ENGINE OIL  CHIP DETECTOR 
TANK  SEE  D 
FWD 

C
PACKING
MAGNETIC CHIP DETECTOR HOUSING PORTMAGNETIC CHIP (REF)
　
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