FOR EXTENDED APU SERVICE LIFE, CORRECTIVE MAINTENANCE ACTION IS NECESSARY IF CONTINUOUS OPERATION ABOVE 649`C IS EXPERIENCED.
CAUTION:_______ IF THE EGT IS IN THE YELLOW BAND (710-760`C) DURING THE APU OPERATION, DO THE
APU USUAL SHUTDOWN AND DO THE CORRECTIVE ACTION. IF THE EGT IS MORE THAN THE
RED LINE (760`C) DURING THE APU START, DO THE APU USUAL SHUTDOWN AND EXAMINE
THE APU FOR AN OVERTEMPERATURE DURING START. NO EXAMINATION IS NECESSARY IF
THE EGT IS MORE THAN THE RED LINE (760`C) DURING A HEAT SOAK AFTER YOU TRY AN
APU START. IF THE EGT IS MORE THAN THE RED LINE (760`C) DURING ANY STEADY-
STATE OPERATION, DO THE APU USUAL SHUTDOWN IMMEDIATELY AND REPLACE THE APU.
WITH THE RPM INDICATOR AND THE TACHOMETER-GENERATOR INSTALLED.
SUBTRACT 1/2 PSIG FOR EVERY 1000 FT OF ELEVATION.
A SMALL CHANGE IN THE FREQUENCY OF THE APU ELECTRICAL GENERATOR (2-4 Hz) AND THE BLEED
DUCT PRESSURE (1-2 PSI) IS ACCEPTABLE FOR THE FULLY LOADED CONDITION.
FOR THE FULLY LOADED CONDITION, THE EGT MUST ONLY BE MEASURED WITH THE SPECIFIED LOAD
CONDITIONS (2 A/C PACKS, PLUS 100 AMPS). ANY DIFFERENCE IN THE LOAD CONDITIONS WILL GIVE
AN INCORRECT EGT INDICATION.
FREQUENCY WILL INCREASE AS ALTITUDE INCREASES UP TO 420 Hz AT 35,000 FT.
Operation Limits
Figure 201 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. úAIRPLANES WITHOUT THE ETC ú
49-11-00
ú ú 01.1 Page 202 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
IN ONE HOUR STARTS OR TRIES TO START (STARTER "ON" TIME) OPERATION (BEFORE YOU TRY TO START AGAIN) COOL DOWN
1 0-90 SEC (MAX) 0 MINUTES
2 0-90 SEC (MAX) 5 MINUTES (MIN)
73 0-90 SEC (MAX) 60 MINUTES (MIN)
VISUALLY EXAMINE THE BRUSH ASSEMBLIES FOR DISCOLORATION IN THE STARTER AFTER YOU TRY TO START THE APU A THIRD TIME.
-51.1 (-60) -28.9 (-20) -17.8 (0) -6.7 (20) 15.6 (60) 37.8 (100) 60.0 (140)
OUTSIDE AIR TEMPERATURE, `C (`F)
MAXIMUM TIME TO START
Operation Limits
Figure 201 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. úAIRPLANES WITHOUT THE ETC ú
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ú ú 01.1 Page 203 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
FOR EXTENDED APU SERVICE LIFE, CORRECTIVE MAINTENANCE ACTION IS NECESSARY IF CONTINUOUS OPERATION ABOVE 649`C IS EXPERIENCED.
CAUTION: IF THE EGT IS IN THE YELLOW BAND (710-760`C) DURING THE APU OPERATION, DO THE APU USUAL SHUTDOWN AND DO THE CORRECTIVE ACTION. IF THE EGT IS MORE THAN THE RED LINE (760`C) DURING THE APU START, DO THE APU USUAL SHUTDOWN AND EXAMINE THE APU FOR AN OVERTEMPERATURE DURING START. NO EXAMINATION IS NECESSARY IF THE EGT IS MORE THAN THE RED LINE (760`C) DURING A HEAT SOAK AFTER YOU TRY AN APU START. IF THE EGT IS MORE THAN THE RED LINE (760`C) DURING ANY STEADY-STATE OPERATION, DO THE APU USUAL SHUTDOWN IMMEDIATELY AND REPLACE THE APU.
WITH THE RPM INDICATOR AND THE TACHOMETER-GENERATOR INSTALLED. SUBTRACT 1/2 PSIG FOR EVERY 1000 FT OF ELEVATION.
A SMALL CHANGE IN THE FREQUENCY OF THE APU ELECTRICAL GENERATOR (2-4 Hz) AND THE BLEED DUCT PRESSURE (1-2 PSI) IS ACCEPTABLE FOR THE FULLY LOADED CONDITION.
FOR THE FULLY LOADED CONDITION, THE EGT MUST ONLY BE MEASURED WITH THE SPECIFIED LOAD CONDITIONS (2 A/C PACKS, PLUS 100 AMPS) AND T2 SENSOR DISCONNECTED. ANY DIFFERENCE IN THE LOAD CONDITIONS WILL GIVE AN INCORRECT EGT INDICATION.
FREQUENCY WILL INCREASE AS ALTITUDE INCREASES UP TO 420 Hz AT 35,000 FT.
Operation Limits
Figure 201 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. úAIRPLANES WITH THE ETC ú
49-11-00
ú ú 03.1 Page 204 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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