b. LCIT > 24 deg. C
R **ON A/C 063-099, 401-499,
B. Parameter Values during different APU running states.
TABLE A -------+-----------------------------------------------------------+-----------ALPHA | MODE | +-----------+-----------+-----------+-----------+-----------+ CODE | RTL | 0 ECS | 1 ECS | 2 ECS | MES | UNIT -------+-----------+-----------+-----------+-----------+-----------+-----------IGV | 22 | 56 | 64 - 72 |a. 56 - 92 | 77 - 88 | degrees | | | |b. 70 - 92 | | -------+-----------+-----------+-----------+-----------+-----------+-----------WB | NA | 0.4 - 0.5 | 0.4 - 0.5 | 0.4 - 0.5 | 0.4 - 0.5 | kg/sec -------+-----------+-----------+-----------+-----------+-----------+-----------LCIT | TAT -| TAT + | TAT + | TAT + | TAT + | deg. C. | (1 to 2) | (1 to 2) | (1 to 2) | (1 to 4) | (1 to 8) | (deg. C.) -------+-----------+-----------+-----------+-----------+-----------+-----------ADW1 | 0810A | 08109 | 08109 | 00109 | 08509 | digits -------+-----------+-----------+-----------+-----------+-----------+-----------PD1/2 | NA | 26/26 | > 20/20 | > 14/14 | > 20/20 | psig -------+-----------+-----------+-----------+-----------+-----------+-----------PT | NA | > 26 | > 26 | > 26 | > 26 | psig | (NA) | (> 1.8) | (> 1.8) | (> 1.8) | (> 1.8) | (bar) -------+-----------+-----------+-----------+-----------+-----------+-----------
a. LCIT < 24 deg. C
b. LCIT > 24 deg. C
R **ON A/C 001-003, 051-099, 401-499,
4. Fault Isolation
_______________
**ON A/C 001-003, 051-062,
A. If the self test gives the maintenance message:
- CHECK PRESS XDCR WIRING OR ECB 59KD (Ref. TASK 49-00-00-810-831),
- DIFFERENTIAL PRESS XDCR P24 (Ref. TASK 49-00-00-810-827),
- TOTAL PRESS XDCR P23 (Ref. TASK 49-00-00-810-828),
- SURGE CTL VALVE P18 (Ref. TASK 49-00-00-810-830),
- INLET GUIDE VANE ACTR P21 (Ref. TASK 49-00-00-810-824),
- LOAD CTL VALVE P12 (Ref. TASK 49-00-00-810-830).
- LOAD COMPRESSOR INLET TEMP SNSR (Ref. TASK 49-20-00-810-802).
B. If the IGV parameter values are out of range:
- check that the EGT increase during a mode change (i.e. RTL to ECS).
NOTE : RTL = Ready To Load
____
(1) If the EGT increases:
- remove the IGV ACTUATOR P21 (Ref. AMM TASK 49-23-51-000-002).
- do a push/pull test on the IGVs to check the IGV movement. .make sure that the IGV has a travel range of 1 in. (25.3999 mm), .measure the force of the IGV movement.
「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 : 001-003, 051-099, 401-499, ∞∞49-00-00∞∞∞∞∞∞∞∞∞∞Page A268
Config-1 Aug 01/05 CES
(a) If a force less than 30 lbf.ft (4.0674 m.daN) is necessary to move the IGVs:
- replace the IGV ACTUATOR P21 (Ref. AMM TASK 49-23-51-000-002) and (Ref. AMM TASK 49-23-51-400-002).
(b) If a force more than 30 lbf.ft (4.0674 m.daN) is necessary to move the IGVs or the travel range is less than 1 in. (25.3999 mm):
- replace the APU (Ref. AMM TASK 49-11-11-000-001) and (Ref. AMM TASK 49-11-11-400-001).
(2) If the fault continues:
- check the APU bleed system for leaks.
C. If the WB parameter values are out of range:
NOTE : If the value is displayed in (lb/sec) the value is 0.88 to 1.10
____
lb/sec.
- check on the visual position indicator the surge control valve position and make sure that it is in the closed position or very near to the closed position in ECS or MES mode.
(1) If the surge control valve is not closed or not very near to the closed position:
- clean the surge valve filter (Ref. AMM TASK 49-51-52-600-001).
(a) If the fault continues:
- replace the SURGE CONTROL VALVE P18 (Ref. AMM TASK 49-51-52-000-002) and (Ref. AMM TASK 49-51-52-400-002).
(b) If the fault continues:
- replace the PNEUMATIC SENSOR ASSY (Ref. AMM TASK 49-51-13-000-001) and (Ref. AMM TASK 49-51-13-400-001).
(c) If the fault continues:
- replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001).
(2) If the surge control valve is closed or very near to the closed position:
- do a check of the aircraft bleed system for leaks.
R D. If the PD is more than 8 psig lower than PT (ECS or MES mode):
NOTE : PD = main engine precooler inlet air pressure (source BMC).
____
NOTE : As a general rule, the pressure drop accross the cross bleed valve
____ is 3 psig, therefore PD (RTL mode) shows approx. 3 psig higher than PD (ECS or MES mode).
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