S 024-005-N00

 (4)  
While you hold the MCD probe (4, 12, or 20) in, turn the MCD probe counterclockwise until it stops.

 S 024-006-N00

 (5)  
Pull the MCD probe (4, 12, or 20) straight out.

 S 214-007-N00

 (6)  
Examine the MCD probe (AMM 79-21-10/601).

 S 034-008-N00

 (7)  
Install the protection caps.

 TASK 79-21-10-004-009-N00
 3.  Remove the Magnetic Chip Detector Housing (Fig. 401)_________________________________________
 A. Standard Tools and Equipment
 (1)  
Container - 5 U.S. gallon (19 liter) minimum
 capacity, used to catch the oil

 B.
References

 (1)  
IPC 72-61-00 Fig. 10

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(2)
IPC 79-11-01 Fig. 10

 (3)
IPC 79-21-04 Fig. 1

 C.
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

 D.
Procedure

 S 014-010-N00
 (1)
Do the task:  "Remove the Magnetic Chip Detector Probe".

 S 024-049-N00

 (2)
Remove the magnetic chip detector housing as follows:

 (a) Put the container below the applicable drain port.
 WARNING: BEFORE YOU OPEN THE OIL TANK CAP, PERMIT A MINIMUM OF FIVE
_______ MINUTES AFTER THE ENGINE SHUTDOWN TO LET THE PRESSURE IN THE OIL TANK BLEED OFF. A FAST FLOW OF HOT OIL CAN OCCUR AND CAUSE INJURY TO YOU.
 DO NOT KEEP THE OIL ON YOUR SKIN FOR A LONG TIME. IF YOU DO NOT CLEAN THE OIL OFF, THE OIL CAN CAUSE INJURY.
 CAUTION: IF YOU DO NOT CLEAN THE OIL OFF, THE OIL CAN CAUSE A STAIN
_______
 ON YOUR CLOTHES AND PAINT WILL BECOME SOFT.

 (b)
Loosen the oil tank cap.

 (c)
Remove the lockwire from the housing.

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 ALL  ú ú N02 Page 407 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
WARNING:_______BE CAREFUL WHEN YOU DRAIN OIL FROM A HOT ENGINE. HOT OIL IS DANGEROUS. IF IT TOUCHES YOUR SKIN OR YOUR EYES, IT WILL CAUSE INJURY.
 CAUTION: WHEN YOU REMOVE THE VALVE THAT IS IN THE MAIN GEARBOX,
_______
 HOLD THE GEARBOX WITH A WRENCH.

 (d)  
Put a wrench on the flats of the housing and remove the housing.

 (e)  
Discard the packing (2) from the MCD housing (1).

 NOTE: The assembly packing is next to the hex of the housing.
____
 (f)  
Tighten the oil tank cap.

 (g)  
Install the protection caps.

 E.  
Remove the probe packing and the housing packing (Fig. 402)

 S 034-043-N00
 (1)  
Do the steps that follow to remove the probe packing:

 (a)  
Remove the magnetic probe (4, 12, or 20).

 (b)  
Remove and discard the packing (19) that is on the probe.
　
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