S 022-062
(11)
Remove the APU Shutoff Valve to be examined (AMM 36-11-10).
S 212-063
(12)
Examine the APU Shutoff Valve for volcanic ash (AMM 36-11-10).
S 212-064
(13)
Examine the ground air connectors for volcanic ash.
S 712-065
(14)
Make sure the duct pressure transducers operate (AMM 36-21-00).Examine the External Light Lenses
S 212-066
(1)
Examine the external light lenses for abrasions. If the lenses are
frosted or damaged, they must be replaced when it is possible.Examine the Fuel System
S 682-067
(1) Get fuel samples from each fuel tank sump and examine them for signs of volcanic ash (AMM 12-11-03).
(2) S 682-068Get fuel samples from each surge tank sump (if there is fuel in the surge tank). Examine the fuel samples for signs of volcanic ash (AMM 12-11-03).
(3) S 212-069Examine the surge tank internally for signs of volcanic ash (AMM 28-11-03).
Examine the Oxygen System
NOTE: Do these steps only if there are signs of volcanic ash
____ contamination in the flight deck and main deck cabin.
S 212-070
(1)
Examine the oxygen system as follows:
(a)
Examine the diluter demand regulators for the crew oxygen masks, for volcanic ash.
(b)
Examine the oxygen masks of the portable oxygen cylinders for volcanic ash.
(c)
Examine the passenger and crew oxygen masks for volcanic ash.Examine the Auxiliary Power Unit (APU)
S 212-071
(1)
Examine the air intake plenum for signs of volcanic ash (AMM 49-15-03).
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MAINTENANCE MANUAL
S 212-072
(2) Examine the exhaust duct for signs of volcanic ash (AMM 49-81-01).
NOTE:____Look at the air intake plenum and the exhaust duct. If there are no signs of volcanic ash, the procedure to examine the Auxiliary Power Unit (APU) is complete. The remaining APU steps are not necessary.
S 292-073
(3)
Make an inspection of the APU compressor and turbine sections with a borescope (AMM 49-21-00).
S 022-074
(4)
Remove the oil sump magnetic chip detector to be examined (AMM 49-27-04).
S 212-075
(5)
Examine the magnetic chip detector of the oil sump (AMM 49-27-04).
S 212-076
(6)
Examine the oil pressure and scavenge filter elements (AMM 49-27-03).
S 212-077
(7)
Examine the fuel filter elements (AMM 49-31-04).
S 212-078
(8)
Examine the Fuel Divider Filter element (AMM 49-31-08).
S 022-079
(9)
Remove the Surge Bleed Air Valve to be examined (AMM 49-53-01).
S 212-080
(10)
Examine the surge bleed air valve and ducts for signs of volcanic volcanic ash (AMM 49-53-01).
S 022-081
(11)
Remove the APU Air Intake Door to examine the Air Intake Door Actuator (AMM 49-15-05).
S 212-082
(12)
Examine the APU Air Intake Door Actuator for signs of volcanic ash (AMM 49-15-06).
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757 MAINTENANCE MANUAL
L. Examine the Potable Water System
S 022-083
(1)
Remove the air filter to be examined (AMM 38-15-02/401).
S 212-084
(2)
Examine the air filter for signs of volcanic ash (AMM 38-15-02/401).
NOTE:____Look at the air filters. If there are no signs of volcanic ash, the procedure to examine the Potable Water System is complete. The remaining Potable Water system steps are not necessary.
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