FWD SEE A SEE B A SEE C FWD
APU COMPARTMENT LOAD GEARBOX PORT
GEARBOX PORT ACCESSORY
1. PACKING
1. PACKING
DETECTOR 2. CHIP DETECTOR 2. CHIP
4. PACKING 5. PACKING
B FWD PLUG 3. MAGNETIC 4. PACKING 5. PACKING FWD C PLUG 3. MAGNETIC
Chip Detector Inspection
Figure 601
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747-400 MAINTENANCE MANUAL
5) Install the two magnetic plugs (3) in the two chip detectors (2).
NOTE:____ Push in and turn the two magnetic plugs (3) 90°
until the two locking tabs engage the valve body of
the two chip detectors (2). The red lines and
grooves of the magnetic plug and valve body must be
aligned together.
6) Replace the oil filter element (AMM 49-27-03/401).
NOTE:____ During the oil filter element installation test,
make sure you operate the APU for a minimum of 15
minutes before you do the APU usual shutdown.
7) Remove the two magnetic plugs (3) from the two chip
detectors (2).
NOTE:____ Push in and turn to unlock the two magnetic plugs
(3) for the removal.
8) Remove the four packings (4), (5) from the two magnetic
plugs (3) and two chip detectors (2).
a) Discard the four packings (4), (5).
9) Visually examine the two magnetic plugs (3) for metal
particles.
10) If you find more metal particles on the two magnetic plugs
(3), replace the APU (AMM 49-11-01/401).If you do not find metal particles on the two magnetic plugs (3), visually examine the two valve bodies of the two chip detectors (2) for leakage: 1) Clean the two valve bodies of the two chip detectors (2)
with alcohol and a cloth. 2) Use the air source to dry the two valve bodies of the two chip detectors (2).
NOTE: It is recommended that you use a pressure of 30-60
____ psig (207-414 kPa) of air or nitrogen to dry the two valve bodies of the two chip detectors.
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747-400
MAINTENANCE MANUAL
Visually examine the two valve bodies for oil leakage.If you find oil leakage on the two valve bodies, do these steps:
a) Do this task: Drain the APU Oil (AMM 12-22-02/301).
b) Remove the applicable chip detector(s) (2) from the
accessory or load gearbox port.
c) Remove and discard the packing(s) (1).
d) Lubricate the new packing(s) (1) with a light coat of
oil.
e) Install the packing(s) (1) on the valve body of the
chip detector(s) (2).
f) Install the chip detector(s) (2) in the accessory or
load gearbox port.
g) Tighten the chip detector(s) (2) to 40-50 inch-pounds
(4.5-5.7 newton-meters).
h) Install the lockwire on the valve body of the chip
detector(s).
i) Make sure the two magnetic plugs (3) are clean. If the
magnetic plugs are not clean, clean the plugs with
alcohol and a cloth.
j) Make sure the two magnetic plugs (3) can each lift an
eight ounce (0.23 kilogram) (minimum) ferromagnetic
steel weight.
k) If the two magnetic plugs (3) cannot lift the weight,
replace the magnetic plug(s).
l) Lubricate the four new packings (4), (5) with a light
coat of oil.
m) Install the two packings (4) on the two magnetic plugs
(3) and two packings (5) on the two chip detectors (2).
n) Install the two magnetic plugs (3) in the two chip
detectors (2).
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