Minimum Idle Check [CFMI]

TASK 71-00-00-710-006-A
Minimum Idle Check

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.

WARNING: DO NOT TRY TO STOP THE FAN FROM TURNING BY HAND. THIS CAN CAUSE INJURY TO THE PERSONS AND DAMAGE TO THE EQUIPMENT.

WARNING: MAKE SURE THAT THE LANDING GEAR GROUND SAFETIES AND THE WHEEL CHOCKS ARE IN POSITION. MOVEMENT OF THE AIRCRAFT CAN BE DANGEROUS.

WARNING: DO NOT DO AN ENGINE RUN-UP WITH THE THRUST REVERSER COWLS OPEN. IF YOU OPERATE THE ENGINE AT MORE THAN IDLE, THE FAN COWLS MUST NOT BE OPEN. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT CAN OCCUR.

WARNING: - ENGINE OPERATION MUST NOT EXCEED MINIMUM IDLE WHEN PERSONNEL ARE IN ENTRY/EXIT CORRIDOR.

POSITIVE COMMUNICATION BETWEEN THE FLIGHT COMPARTMENT AND PERSONNEL IN ENTRY EXIT CORRIDOR IS NECESSARY.
INLET AND EXHAUST HAZARD AREAS MUST BE STRICTLY OBSERVED BY PERSONNEL IN ENTRY/EXIT CORRIDOR.

WARNING: MAKE SURE THAT:

THE PASSENGER DOORS ARE CLOSED AND THE PASSENGER LOADING STAIRS ARE REMOVED WHEN AT LEAST ONE ENGINE IS OPERATED ABOVE IDLE POWER.
THE CARGO DOORS ARE CLOSED AND CARGO LOADING EQUIPMENT IS REMOVED WHEN:

. ENGINE 2 IS OPERATED AT IDLE OR ABOVE . AT LEAST ONE ENGINE IS OPERATED ABOVE IDLE POWER IF YOU DO NOT OBEY THESE PRECAUTIONS INJURY TO THE PERSONNEL AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT CAN OCCUR.

CAUTION: - SEE THE APPLICABLE FIGURE FOR WIND LIMIT RESTRICTIONS WHEN THE ENGINE OPERATES.

NATURAL WINDS AND IRREGULAR FORCES FROM SUDDEN GUSTS INCREASE THE DANGEROUS AREA.
DO NOT GO ABOVE OPEN COWLING LIMITATIONS WHEN YOU DO THE TESTS.
THE OPERATOR MUST FULLY KNOW ALL THE OPERATING LIMITS AND PROCEDURES BEFORE THE ENGINE OPERATES.

CAUTION: OPERATION AT MINIMUM IDLE IN ICING CONDITIONS IS PERMITTED FOR EXTENDED PERIODS. IF THE CONDITION CONTINUES FOR MORE THAN 30 MINUTES , OR IF IMPORTANT ENGINE VIBRATION OCCURS; YOU MUST INCREASE THE ENGINE SPEED TO 70 PERCENT N1 MINIMUM FOR APPROXIMATELY 15 SECONDS BEFORE YOU SELECT A HIGHER THRUST OPERATION.

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
The idle check gives instructions to make sure that the engine connections do not leak.
It also permits you to makes sure that noise from engine operation is normal and that all engine instruments give the correct indications.

NOTE: Do a visual leak check if disconnect without engine plumbing static pressure check after installation.

NOTE: For a visual leak check after replacement of a component, it is not necessary to record parameters.

2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 71-00-00-710-003-A	Engine Automatic Start
TASK 71-00-00-710-028-A	Engine Shutdown
TASK 71-00-00-790-002-A	Fuel or Hydraulic or Oil Leakage Limits
TASK 71-00-00-790-003-A	Drain Mast Leakage Identification Procedure
TASK 71-00-00-869-005-A	Wind Limitations During Engine Ground Operations
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
TASK 79-00-00-210-005-A	Visual Inspection of the Oil System
Oil Pressure versus Engine Core Speed

3. Job Set-up
Subtask 71-00-00-861-056-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 71-00-00-010-053-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 71-00-00-869-082-A ** ON A/C NOT FOR ALL

C. Preparation for Test
(1) Obey the wind limitations during Engine Ground Operations (Ref. AMM TASK 71-00-00-869-005).
(2) Make sure that the engine inlet and exhaust covers have been removed. Make sure that these areas are clear of any foreign objects.
(3) Make a visual check of the temperature sensors, fan inlet, and exhaust areas. If snow or ice has collected in the fan duct, make sure that the fan turns freely. Also, make sure that the engine inlet, inlet lip, fan, spinner, and fan exhaust duct are clear of ice or snow. If the fan does not turn freely, melt the ice or snow with hot air before an engine operation.
(4) Look at the general condition of the fan spinner and fan blades, core exhaust nozzle, LPT and external surfaces of the cowls.
(5) Check oil quantity. Make a check of the drain ports for fuel, oil and hydraulic leaks. Also make sure that fuel drained from the engine does not cause a fire. (Ref. AMM TASK 71-00-00-790-002) and (Ref. AMM TASK 71-00-00-790-003).

Subtask 71-00-00-869-076-A ** ON A/C NOT FOR ALL

D. Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).

Subtask 71-00-00-710-062-A ** ON A/C NOT FOR ALL

E. Start the engine (Ref. AMM TASK 71-00-00-710-003).

4. Procedure
Subtask 71-00-00-710-063-A ** ON A/C NOT FOR ALL

A. Do this procedure:
(1) Let the engine become stable at minimum idle for 3 minutes and make sure that the parameters below are in the limits:
(a) N2 speed should not be below 58.3 percent N2.
(b) Oil pressure

Oil Pressure versus Engine Core Speed ** ON A/C NOT FOR ALL

(c) The EGT is approximately at 440 deg.C (824 deg.F) (normal temperature) for an ambient temperature T12 of 15 deg.C (59 deg.F).

NOTE: All engines have an EGT that is different. The EGT will increase as an engine collects time. The condition and bleed configuration of each engine can cause EGT differences between engines. If N1, N2 and fuel flow are satisfactory at minimum idle, you can have EGT differences as much as 60 Deg.C or larger.

(2) Make a visual inspection of the fuel, and pneumatic lines, fittings and accessories for leaks. For oil leakage, staining or wetting from/on the oil system tubes, hoses and components (Ref. AMM TASK 79-00-00-210-005).

WARNING: DO NOT LET THE HMU TEMPERATURE EXCEED 100 DEG.C (212 DEG.F).

(3) Safety precaution:

NOTE: Hydromechanical Units (HMUs) that have fluorocarbon (Viton) external seals (SB 73-078) can leak fuel for a short time when they are below 0 deg.C (32.00 deg.F) (Modification 1 and 2) (Ref. AMM TASK 71-00-00-790-002) . If the ambient temperature is below -40 deg.C (-40.00 deg.F) it is recommended to heat the HMU (modification 1 and 2) to minimize leakage during starts per the following procedure:

(a) Heat the HMU housing with a suitable hot air blower (Keco GH100, Aerotech BT400-45 or equivalent) operating at 140 deg.C (284.00 deg.F) until the HMU housing temperature is greater than 25 deg.C (77.00 deg.F).

NOTE: The HMU should be warm to the touch but not hot.
-If the fuel leakage stops in less than 5 minutes at idle, continue operation of the engine.
-If the fuel leakage continues after 5 minutes at idle, shut down the engine and repair the source of the leakage.

(4) Stop the engine (Ref. AMM TASK 71-00-00-710-028).

Subtask 71-00-00-040-053-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 71-00-00-010-054-A ** ON A/C NOT FOR ALL

C. Open the thrust-reverser cowl doors (Ref. AMM TASK 78-36-00-010-040).
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

5. Close-up
Subtask 71-00-00-410-059-A ** ON A/C NOT FOR ALL

A. Close the thrust-reverser doors (Ref. AMM TASK 78-36-00-410-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 71-00-00-440-053-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 71-00-00-410-053-A ** ON A/C NOT FOR ALL

C. Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 71-00-00-862-055-A ** ON A/C NOT FOR ALL

D. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 02:21:29 UTC