(a) Remove the connectors P5 and P9 on the APU.
(b) With the APU off, do a test of the continuity across pins 1+2 at the filter DP switches, value should be >10 kOhm.
(c) With the APU off, test the continuity from pin 1 and switch case at the filter DP switches, value should be >10 kOhm.
(d) If either switch do not pass the above checks, replace it. This can be the solution of the problem.
- If the switches pass the check, continue.
(e) The oil temperature should be < 80 F, then start the APU and monitor the DP switches with a multi-meter while the oil temperature increase.
- Monitor if either switch closes during or after the start ( a closed switch is specified as < 30 Ohm ).
(f) Monitor APU Toil until the temperature is more than 100 F (38 C). You can apply an electrical load to the APU to increase the APU oil temperature faster.
- APU Toil can be given through the ECAM by the aircraft AIDS system, code "OTA".
- After the APU oil temperature has increased to over 38 C, do a test if both DP switches are open.
「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, ∞∞49-90-00∞∞∞∞∞∞∞∞∞∞Page 202
201-210, Config-2 Aug 01/05 CES
(3) If no problems were found with the above procedure, do a test of the APU wiring harness as follows.
- Install connector P5 and P9.
- Remove connector P1 at the APU compartment bulkhead.
- Do a test of the continuity across pins 4+9 at the firewall, no continuity is permitted.
- Do a test of the continuity across pin 9 and structural ground, no continuity is permitted.
- Bend the wires near the plugs to test for intermittent short circuits.
(4) If no problems were found with the above procedure, do a test of the aircraft wiring harness as follows.
- Install connector P1 at the APU compartment bulkhead.
- Remove the ECB.
- Do a test of the continuity from pin C11 to structural ground, no continuity is permitted.
- Bend the wires near the plugs to test for intermittent short-circuits.
(5) If no problems were found with the above procedure, replace both DP switches (Ref. AMM TASK 49-91-14-000-002) and (Ref. AMM TASK 49-91-14-400-002).
(6) If clogged filter shutdown problems continue, replace the ECB. (Ref. AMM TASK 49-61-34-000-003) and (Ref. AMM TASK 49-61-34-400-003).
(7) If clogged filter shutdown problems continue, replace the APU. Ship the APU to Honeywell together with the generator. (Ref. AMM TASK 49-11-11-000-004) and (Ref. AMM TASK 49-11-11-400-004).
**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 the APU GND SCANNING menu gives the maintenance message:
OIL FILTER SWITCHES (8070KM)/(8071KM)
associated with Fault Code Number (FCN) 101
- do a check for damage/contamination of the electrical connector P9 and P5 of the OIL FILTER SWITCHES (8070KM)/(8071KM)
(1) If the electrical connector P9 and/or P5 is damaged do a repair. If it is
- contaminated, clean it.
「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, ∞∞49-90-00∞∞∞∞∞∞∞∞∞∞Page 203
201-210, Config-2 Aug 01/05 CES
(2) If the electrical connector are servicable:
(a) Remove the connectors P5 and P9 on the APU.
(b) With the APU off, do a test of the continuity across pins 1+2 at the filter DP switches, value should be >10 kOhm.
(c) With the APU off, do a testof the continuity from pin 1 and switch case at the filter DP switches, value should be >10 kOhm.
(d) If either switch do not pass the above test, replace it. This can be the solution of the problem.
- If the switches pass the test, continue.
(e) The oil temperature should be < 80 F, then start the APU and monitor both DP switches with a multi-meter while the oil temperature increase.
- Monitor if either switch closes during or after the the start ( a closed switch is specified as < 30 Ohm ).
(f) Monitor APU Toil until the temperature is more than 100 F (38 C). You can apply an electrical load to the APU to increase the APU oil temperature faster. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 机载辅助动力 2(172)
