79-21-09
 ALL  ú ú N03 Page 422 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
MAGNETIC CHIP DETECTOR - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  This procedure gives the instructions to remove and install the magnetic chip detector (MCD).
 B.  The MCD includes a housing with an integral check valve, and a magnetic probe. The removal and installation procedures for the probe and housing are in different tasks.
 C.  There are six MCD's installed as follows:
 (1)
The drain port in the main gearbox

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

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

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

 (b)
The scavenge oil inlet of 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

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

 E.  
To remove the magnetic chip detector assembly, you must remove the probe first, then remove the housing.

 TASK 79-21-10-004-001-N00
 2.  Remove the Magnetic Chip Detector Probe (Fig. 401)_______________________________________
 A.  References
 (1)
AMM 71-11-04/201, Fan Cowl Panels

 (2)
AMM 71-11-06/201, Core Cowl Panels

 (3)
AMM 78-31-00/201, Thrust Reverser System

 (4)
IPC 72-61-00 Fig. 10

 (5)
IPC 79-11-01 Fig. 10

 (6)
IPC 79-21-04 Fig. 1

 B.  
Access

 (1)
Location Zone

 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
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-21-10
 ALL  ú ú N01 Page 401 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
ANGLE GEARBOX 
MAGNETIC 
NO. 3 BEARING  CHIP DETECTOR 
NO. 4 BEARING MAGNETIC CHIP DETECTOR SEE B MAGNETIC CHIP DETECTOR  SEE  B  NO. 1, 1.5, AND 2 BEARING MAGNETIC CHIP DETECTOR SEE B 
SEE  B 
SEE  A  SEE  C  (SHEET 2) 

INTEGRATED DRIVE GENERATOR (REF)  LUBRICATION AND SCAVENGE OIL PUMP  FWD MAIN GEARBOX (REF) 
A 
2.  PACKING 
DETECTOR HOUSING MAGNETIC CHIP1. 
4.  MAGNETIC CHIP DETECTOR PROBE  PACKING19.  (REF) PORT 
B 
Magnetic Chip Detector Installation Figure 401 (Sheet 1) 

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-21-10
 ALL  ú ú N02 Page 402 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE  E 
9.  DETECTOR HOUSING MAGNETIC CHIP 10. PACKING  FWD  (REF) GEARBOX MAIN  C  DETECTOR MAGNETIC CHIP DSEE MAIN GEARBOX 
12.  PROBE DETECTOR MAGNETIC CHIP  (REF) PORT 
19. PACKING 
D 

17.  MASTER MAGNETIC 
CHIP DETECTOR 
HOUSING 
PORT 
(REF) 
MAIN 
GEARBOX  MASTER MAGNETIC OIL TANK  18. PACKING 
(REF)  ENGINE OIL  CHIP DETECTOR 
TANK 
SEE  F  19. PACKING 
FWD 
E  F 
MASTER MAGNETIC20. 
CHIP DETECTOR PROBE 
Magnetic Chip Detector Installation 
Figure 401 (Sheet 2)