Subtask 71-00-00-440-057
 B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
 Subtask 71-00-00-410-069
 C. Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

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 Subtask 71-00-00-862-062

 D. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
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 Power Assurance Check
 CAUTION : DO NOT MAKE FAST ACCELERATIONS OR DECELERATIONS.
_______ DO NOT REMAIN AT THE MAXIMUM POWER ASSURANCE SETTING FOR MORE TIME THAN IT IS NECESSARY.
 1. Reason for the Job
__________________
 This procedure gives instructions to make sure the engine can produce the necessary takeoff thrust in line with EGT and N2 limits when N1 is set. The power level used in this procedure is 72.5 percent. The Power Assurance Check is not a good test for performance analysis of the engine. Do not use only the Power Assurance Check to accept or reject an engine. The Power Assurance run is usually not sufficiently stable to accurately determine the engine's health. You can get a more reliable performance analysis by doing a test cell operation or on-wing performance trend monitoring.
 NOTE : If the engine parameters are out of the targets of the power
____ assurance table after a first test run, the power assurance check may be repeated. It is possible that engine replacement will be necessary by the conditions that follow:
 - The engine continues to go above EGT or N2 limits during normal operation after two test operations.

 - Troubleshooting has been completed by the instructions in the TSM without correction of the problem. Do not use the power assurance check as the only cause for engine replacement.

 NOTE : The examples shown in this procedure are for these test conditions:
____
 - OAT = 25 deg. C

 - N1 modifier for this engine = 2

 - 72.5 percent power setting

 - altitude 4000 feet.

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______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
 from the External Power 71-00-00-710-003 Engine Automatic Start 71-00-00-710-028 Engine Shutdown 71-00-00-869-001 Abnormal Operation and Emergency Procedures 71-00-00-869-003 Wind Limitations During Engine Ground Operations 72-00-00-200-008 Inspection/Check After the Engine has Exceeded the
 Operational Limits 71-00-00-991-312 Fig. 507 71-00-00-991-314 Fig. 508
 3. Job Set-up
__________
 Subtask 71-00-00-861-063
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
 Subtask 71-00-00-865-104
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU L/G/LGCIU/SYS1/NORM 1GA C09 121VU HYDRAULIC/LGCIU/SYS2 2GA Q35 121VU HYDRAULIC/LGCIU/SYS1/GRND SPLY 52GA Q34
 Subtask 71-00-00-869-104
 C. Preparation for Test
 WARNING : MAKE SURE THAT ALL ENGINE OPERATING AREAS ARE AS CLEAN AS
_______ POSSIBLE. ALL RAMPS, TAXIWAYS, RUNWAYS AND OTHER OPERATING AREAS MUST BE VERY CLEAN TO PREVENT BAD DAMAGE TO THE ENGINE, AIRCRAFT AND PERSONS IN THE AREA.
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 WARNING : DO NOT TRY TO STOP FAN FROM TURNING BY HAND. THIS CAN CAUSE
　
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