B.
Parts

 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 4 | Magnetic Chip Detector Probe | 79-21-04 | 01 | 5 | | | 12 | Magnetic Chip Detector Probe | 72-61-00 | 10 | 25 | | | 19 | Packing | 79-11-01 | 10 | 8 | | | 20 | Master Magnetic Chip Detector | | | 11 | | | | Probe | | | | 2......…........…...................................…...........….....…........1
 C. References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

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

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

 D.
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
 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 416 Right Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 426 Right Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 436 Right Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4
 446 Right Thrust Reverser Half - Engine 4

 E.
Procedure

 S 424-048-N00
 CAUTION:_______MAKE SURE YOU INSTALL THE PART CORRECTLY. IF YOU DO NOT INSTALL THE PART CORRECTLY, AN INFLIGHT ENGINE SHUTDOWN CAN OCCUR.
 MAKE SURE YOU ENGAGE THE MAGNETIC PROBE IN THE HOUSING CORRECTLY.
 CAUTION:_______MAKE SURE YOU USE THE CORRECT PART NUMBER PROBE. SOME PROBES ARE INTERCHANGEABLE (SEE PW SB 72-162, PW SB 79-14, PW SB 79-16 and PW SB 79-59).
 (1) Install the MCD probe (4) into the MCD housing (1) as follows:
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION: MAKE SURE YOU INSTALL THE MCD HOUSING WITH A PACKING ON
_______ IT. IF THE MCD HOUSING DOES NOT HAVE A PACKING, AN OIL LEAKAGE CAN OCCUR AND CAUSE DAMAGE TO THE ENGINE.
 (a)  
Remove the packing (19).

 (b)  
Lubricate the new packing (19) with engine oil.

 (c)  
Install the new packing (19) to the MCD probe.

 (d)  
Clean the remaining oil from the shaft of the MCD probe (4, 12, or 20).

 NOTE: Too much oil on the shaft of the MCD probe can cause a
____ hydraulic lock and make the installation not easy or not possible.
 1)  Put the probe in the housing as follows: a) If applicable, align the pins with the slots.
 NOTE: The pins can be in the ID of the housing, the OD
____ of the housing, the ID of the probe grip, or the OD of the probe.
 2)  Lock the probes as follows:
 a)  PROBES WITH KNURLED GRIPS; While you push the probe in, turn the probe clockwise until it stops.
 NOTE: To make sure the MCD probe (4) is locked, pull
____
 the MCD probe (4).

 b)  PROBES WITH FLUTED GRIPS; While you push on the MCD probe (4), turn the MCD probe (4) clockwise until it stops (1/4 turn).
 NOTE: Make sure the six convex shapes on the grips are
____ aligned with the six points on the MCD housing (1).
 NOTE: To make sure the MCD probe (4) is locked, pull
____
 the MCD probe (4).

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