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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
k) Leakage from the bleed air duct (the clamp at the APU bleed valve, the clamp at the APU turbine plenum, or the slip joint between the APU and the APU shroud)
l) A damaged generator bearing m) A bearing problem that causes a drag.
~..................................................... | | EGT (°C MAXIMUM) | | OUTER AIR ........................................ | TEMPERATURE | ITEM 5 | ITEM 9 | | (°C) | (NO-LOAD IDLE EGT) | (APU EGT) | .......................................................
| -30 | 235-305 | 255-325 |
| -25 | 240-310 | 260-330 |
| -20 | 245-315 | 265-335 |
| -15 | 250-320 | 270-340 |
| -10 | 255-325 | 275-345 |
| - 5 | 260-330 | 280-350 |
| 0 | 265-335 | 285-355 |
| 5 | 270-340 | 290-360 |
| 10 | 275-345 | 295-365 |
| 15 | 280-350 | 300-370 |
| 20 | 285-355 | 305-375 |
| 25 | 290-360 | 310-380 |
| 30 | 295-365 | 315-385 |
| 35 | 300-370 | 320-390 |
| 40 | 305-375 | 325-395 |
| 45 | 310-380 | 330-400 |
| 50 | 315-385 | 335-405 |
2..............…......................…...............1
NOTE: The temperatures not included in this chart can be calculated.
____ If the outer air temperature increases or decreases 1°C, the EGT will increase or decrease 1°C.
OUTER AIR TEMPERATURE vs. EGT CORRECTION
________________________________________ CHART A
_______
(f) Item 6. WRITE DOWN THE NO-LOAD GENERATOR FREQUENCY (405-410
CPS) 1) Used as an RPM indicator 2) Used to calculate the "droop" with a load 3) An overspeed can cause an APU shutdown 4) An underspeed can cause the operation of the 95% switch
which will disconnect the load.
(g)
Item 7. OPEN THE APU BLEED VALVE AND THE ISOLATION VALVE WITH
THE PACK VALVES CLOSED 1) No steps are necessary.
(h)
Item 8. WRITE DOWN THE DUCT PRESSURE (30-50 PSIG)
1) This is used as a reference for the ECS check and gives the condition of the APU.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(i)
Item 9. WRITE DOWN THE APU EGT (SEE CHART A)
1) This is used to measure the duct leakage. The difference between the EGT with the APU bleed valve closed (Item 5) and the EGT with the APU bleed and the isolation valves open gives the duct leakage (20°C maximum).
(j)
Item 10. CLOSE THE APU BLEED VALVE
1) This will make a condition to do a check of the opening rate for the APU bleed valve.
(k)
Item 11. OPEN THE TWO PACK VALVES AND SET MANUAL FULL COLD WITH THE ISOLATION VALVE OPEN
1) This will monitor the load control valve, the regulator, and the thermostat performance.
(l)
Item 12. OPEN THE APU BLEED VALVE
1) If the packs are set to on when you open the APU bleed valve, a maximum flow from the APU will be necessary. This maximum flow will permit the APU bleed valve to look for its maximum opening rate.
(m)
Item 13. WRITE DOWN THE TIME BETWEEN THE OPERATION OF THE BLEED VALVE SWITCH AND THE MINIMUM GENERATOR FREQUENCY (12-14 SECONDS) FOR AN OPERATION ANALYSIS
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