TASK 49-00-81-810-818

 APU AUTO SHUTDOWN - SENSOR FAILURE, Oil Pressure Detection failed (131-9(A))
 1. Possible Causes
_______________
 - LOW OIL PRESSURE SWITCH SHOWS OPEN CIRCIUT

 - OIL LEVEL SHOWS LOW
 - oil level

 - damage/contamination of the electrical connector P14

 - LOW OIL PRESSURE SWITCH (P14)

 - ECB (59KD)

 - LOW OIL PRESSURE SWITCH (8091KM)

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific multimeter
 B. Referenced Information
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REFERENCE DESIGNATION
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AMM 49-00-00-860-008 APU Start by External Power (131-9(A)) AMM 49-61-34-000-003 Removal of the Electronic Control Box (ECB) (131-9(A)) AMM 49-61-34-400-003 Installation of the Electronic Control Box (ECB)
 (131-9(A))
 AMM 49-90-00-600-007 Check and Replenish Oil Level (131-9(A))
 AMM 49-94-14-000-003 Removal of the Low Oil Pressure Switch (8091KM)

 (131-9(A)) AMM 49-94-14-400-003 Installation of the Low Oil Pressure Switch (8091KM) (131-9(A)) ASM 49-61/01
 3. Fault Confirmation
__________________
 A. Read-out of ECB Trouble-Shooting Data
 (1) Put the APU MASTER SW to the ON position.

 (2) Get access to the APU SHUTDOWN report.

 (3) Push the '>' adjacent to LRU DATA:

 - the MCDU menu shows LOW OIL PRESSURE SWITCH SHOWS OPEN CIRCIUT
 OIL LEVEL SHOWS LOW
 (4) Start the APU and apply Bleed Air for 20 seconds, minimum (Ref. AMM TASK 49-00-00-860-008).
 4. Fault Isolation
_______________
R **ON A/C 001-049, 101-105, 107-107, 151-154, 201-207,
 A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:
 SENSOR FAIL
 LOW OIL PRESS SW P14
 LOW OIL LEVEL

 associated with the Fault Code Number (FCN) 98 or 99
 - do a check of the oil level in the APU oil reservoir (Ref. AMM TASK 49-90-00-600-007) and do a check for damage/contamination of the electrical connector P14 of the LOW OIL PRESSURE switch (P14).
 (1) If the electrical connector of the LOW OIL PRESSURE SW (P14) is damaged/contaminated:

 - do a repair/cleaning.

 (2) If the electrical connector is OK:

 - use a multimeter to do a resistance check across pin 1 and pin 2 of the LOW OIL PRESSURE SW (P14).
 (a) If the resistance value is > 10 Ohms:

 - replace the LOW OIL PRESSURE SWITCH (P14) (Ref. AMM TASK 49-94-14-000-003) and (Ref. AMM TASK 49-94-14-400-003).

 (b) If the resistance value is < 10 Ohms:

 - do a check of the aircraft wiring from the ECB (59KD) AB/C5 to the LOW OIL PRESSURE SW (P14) P14/1 and the LOW OIL PRESSURE SW (P14) P14/2 to GND (Ref. ASM 49-61/01).
 1 If the fault continues:
_
 - replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-003) and (Ref. AMM TASK 49-61-34-400-003).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 101-105, 107-107, 151-199, ∞∞49-00-81∞∞∞∞∞∞∞∞∞∞Page 247
 201-210, Config-1 Aug 01/05 CES

 **ON A/C 001-049, 101-105, 151-199, 201-210,

 Post SB 49-1062 For A/C 001-049,101-105,151-154,201-207,
 A. If an APU auto shutdown occurs during the APU operation and the APU SHUTDOWN report gives the maintenance message:
 SENSOR FAIL
 LOW OIL PRESS SW(8091KM)
 LOW OIL LEVEL

 associated with the Fault Code Number (FCN) 98 or 99
 - do a check of the oil level in the APU oil reservoir (Ref. AMM TASK 49-90-00-600-007) and do a check for damage/contamination of the electrical connector P14 of the LOW OIL PRESSURE SW (8091KM)
 (1) If the electrical connector of the LOW OIL PRESSURE SW (8091KM) is damaged/contaminated:

 - do a repair/cleaning.

 (2) If the electrical connector is OK:
　
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