Engine Operation Limits, Guidelines and Special Procedures [IAE]

TASK 71-00-00-860-010-B
Engine Operation Limits, Guidelines and Special Procedures

1. Reason for the Job
This task is for V2500-A5 engines.
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 05-51-26-200-001-A	Inspection after a Major Engine Failure
TSM 77-00-00-810-817	EGT Higher than the Limit on Engine 1 (No Surge or Stall) (Above Idle)
TSM 77-00-00-810-818	EGT Higher than the Limit on Engine 2 (No Surge or Stall) (Above Idle)
TSM 77-00-00-810-930	EGT Higher than the Limit on Engine 1 (Min Idle and below Including Start)
TSM 77-00-00-810-931	EGT Higher than the Limit on Engine 2 (Min Idle and below Including Start)
TSM 77-30-00-810-826	High N1 Vibration Level on Engine 1
TSM 77-30-00-810-827	High N1 Vibration Level on Engine 2
TSM 77-30-00-810-828	High N2 Vibration Level on Engine 1
TSM 77-30-00-810-829	High N2 Vibration Level on Engine 2
TSM 79-00-00-810-838	Elevated Oil Consumption on Engine 1
TSM 79-00-00-810-839	Elevated Oil Consumption on Engine 2
TSM 79-20-00-810-801	No. 4 Bearing-Compartment Scavenge-Valve Stuck Closed or Open on Engine 1
TSM 79-20-00-810-802	No. 4 Bearing-Compartment Scavenge-Valve Stuck Closed or Open on Engine 2
TSM 79-20-00-810-803	No. 4 Bearing Seal Defective or Scavenge Valve Clogged on Engine 1
TSM 79-20-00-810-804	No. 4 Bearing Seal Defective or Scavenge Valve Clogged on Engine 2
TSM 79-20-00-810-809	No. 4 Bearing Scavenge Valve Position Indicator Stuck Closed on Engine 1
TSM 79-20-00-810-810	No. 4 Bearing Scavenge Valve Position Indicator Stuck Closed on Engine 2
TSM 79-20-00-810-811	No. 4 Bearing Scavenge Valve Position Indicator Stuck Open on Engine 1
TSM 79-20-00-810-812	No. 4 Bearing Scavenge Valve Position Indicator Stuck Open on Engine 2
TSM 79-33-00-810-826	Oil Pressure between 60 psi and 80 psi on Engine 1
TSM 79-33-00-810-827	Oil Pressure between 60 psi and 80 psi on Engine 2
TSM 79-33-00-810-830	Oil Pressure less than 80 PSI on Engine 1
TSM 79-33-00-810-831	Oil pressure less than 80 PSI on Engine 2
Differential Main Oil Pressure Limits during Stabilized Ground Operation above IDLE
Differential Main Oil Pressure (DMOP) Idle Correction Equation
Minimum Oil Temperatures
Rotor Speed Limits
Rotor Speed Limits

3. Job Set-up
Subtask 71-00-00-869-151-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 71-00-00-869-138-A ** ON A/C NOT FOR ALL

A. Engine Operation Limits
(1) Exhaust Gas Temperature (EGT) Limits:
(a) Starting, for up to 2 minutes:
635 deg.C (1175.00 deg.F)

NOTE: Refer to engine operation guidelines for more data on starter operation.

(b) Transient:
635 deg.C (1175.00 deg.F)
(c) Take-off, for up to 5 minutes:
635 deg.C (1175.00 deg.F) for V2522, V2524, V2527E and V2527.
650 deg.C (1202.00 deg.F) for V2530 and V2533.
(d) Maximum Continuous:
610 deg.C (1130.00 deg.F)
(e) If the EGT limits are exceeded, refer to the procedures that follow:
1 Do the trouble shooting for EGT higher than limit (above idle) TSM 77-00-00-810-817 and TSM 77-00-00-810-818.
2 Do the trouble shooting for EGT higher than limit (idle or below including start) TSM 77-00-00-810-930 and TSM 77-00-00-810-931.
(2) Oil Pressure Limits:
(a) The differential main oil pressure must be above 80 psi (5.52 bar) (low amber limit) and below 390 psi (26.89 bar) (high limit) in flight.
1 Do a check of the oil system if the differential main oil pressure decrease to 80 psi (5.52 bar) for all operating conditions TSM 79-33-00-810-830 for Engine 1 and TSM 79-33-00-810-831 for Engine 2.
2 If the differential main oil pressure decrease to 60 psi (4.14 bar) for all operating conditions TSM 79-33-00-810-826 for Engine 1 and TSM 79-33-00-810-827 for Engine 2.
3 Do a check of the oil system if the differential main oil pressure increase to above 390 psi (26.89 bar) for in flight operation at all operating conditions TSM 79-20-00-810-801, TSM 79-20-00-810-802, TSM 79-20-00-810-803, TSM 79-20-00-810-804, TSM 79-20-00-810-809, TSM 79-20-00-810-810, TSM 79-20-00-810-811 and TSM 79-20-00-810-812.
(b) The differential main oil pressure must be within the limits given during stabilized ground operation.

Differential Main Oil Pressure Limits during Stabilized Ground Operation above IDLE ** ON A/C NOT FOR ALL

1 If the differential main oil pressure is below the lower limit at idle, correction for main oil temperature and HP speed can be applied during stabilized ground running at idle only using the differential main oil pressure idle correction equation.

Differential Main Oil Pressure (DMOP) Idle Correction Equation ** ON A/C NOT FOR ALL

2 If the differential main oil pressure is below the lower limit, perform trouble shooting TSM 79-33-00-810-830 or TSM 79-33-00-810-831.
(c) During operation in cold weather, the scavenge oil filter differential pressure switch warning is inhibited until the main oil temperature gets to approximately 32 deg.C (90 deg.F) in order to prevent false indication of a clogged filter due to cold oil.
(d) The No. 4 compartment scavenge oil pressure range is 0 to 205 psig (0 to 1413,4kPa) at the highest power settings when the No.4 scavenge valve is CLOSED. The normal operating pressure is 0 to 145 psig (0 to 999.7kPa) after three minutes of stabilization.
(e) The indicated oil pressure can be different between engines by as much as 80 PSIG (551,6kPa) without this being an indication of an oil system malfunction.
(f) When EIU1(2) is not energized (for instance when channels A and B of FADEC 1 are switched off, EIU1 is no longer energized; when FADEC 2 channel A is turned off, EIU2 is no longer energized), the SDAC input (that corresponds to a conversion of a voltage coming from the pressure sensor) is used to display the ENG1(2) oil pressure on the engine status page.
In some cases, the oil pressure displayed value can be 2 psi (0.14 bar), while the actual oil pressure is 0, due to the lack of precision of the SDAC acquisition stage near 0 psi (0 bar).
This is a normal phenomenon which no longer exists when the FADEC and EIU are energized correctly.
(3) Oil Temperature Limits:
(a) The maximum oil temperature is 155 deg.C (311.00 deg.F) (when operation is stabilized for a minimum of three minutes). If the oil temperature is higher than 155 deg.C (311.00 deg.F), find the cause of the high temperature, as soon as possible.
(b) The maximum transient temperature is 165 deg.C (329.00 deg.F) for 15 minutes after any high power operation. If the temperature is higher than 165 deg.C (329.00 deg.F) shut down the engine and find the cause of the high temperature as soon as possible.
(c) Minimum oil temperatures are shown in the illustration that follows:

Minimum Oil Temperatures ** ON A/C NOT FOR ALL

(4) Rotor Operation Speed limits:
(a) The maximum N1 is 5,650/rpm/100 percent
(b) The maximum N2 is 14,950/rpm/100 percent

NOTE: If the rotor speeds are more than these limits:

Rotor Speed Limits ** ON A/C NOT FOR ALL

(5) Nacelle Temperature Limit:
(a) The nacelle temperature advisory comes on at 320 deg.C (608.00 deg.F).

Subtask 71-00-00-869-137-A ** ON A/C NOT FOR ALL

B. Engine Operation Guideline
(1) Oil consumption guidelines
(a) Oil consumption is acceptable if the consumption is not more than 0.6 US pints (0.5 Imperial pint) (approximately 0.3 quart) each hour.
(b) If high oil consumption is experienced greater than 0.3 US Qts/Hr (0.6 pts/hr) TSM 79-00-00-810-838 or TSM 79-00-00-810-839.

NOTE: If it is found that the oil level has increased by 0.42 US pints (200ccs) or more compared to before, obtain an oil sample and send it to the laboratory for the fuel contamination check

(c) The minimum time of operation for a check of oil consumption is 30 minutes. The engine must have operated at high and low thrust lever positions during these 30 minutes.
(2) Starter Operation Guideline
(a) Usual starter operation time must not be more than two minutes.
(b) Do the starter procedure that follows:
1 Do three consecutive cycles (two cycles of two minutes and one cycle of one minute).
2 Stop operation for 15 seconds between cycles to let the starter rotor lubricate again.
3 After three cycles, stop for 30 minutes to let the starter become cool.
4 Do not engage the starter again with the engine motoring above 10 percent N2.
(c) Starter operating pressure is between 30 and 40 psig (206,84 and 275,79 kPa).
(3) Vibration limits and fan trim balance vibration guidelines.
(a) Vibration limits (steady state):
N1 (peak): 5.0 Units
N2 (peak): 5.0 Units
1 Engines that have vibrations within the vibration limits are acceptable.
2 Engines that have N1 peak vibration that exceeds the above limit, trouble shoot per TSM TSM 77-30-00-810-826 or TSM 77-30-00-810-827
3 Engines that have N2 peak vibration that exceeds the above limit, trouble shoot per TSM TSM 77-30-00-810-828 or TSM 77-30-00-810-829.
4 A non-revenue ferry flight to a maintenance base is permissible with N1 or N2 vibration above limits, if no fault in the respective trouble shooting procedures in steps 2_ and 3_ above. This condition is permissible for only one engine per aircraft.
(b) Vibration guidelines.
N1 (peak): 2.0 Units
1 Fan trim balance is recommended any time N1 peak vibration exceeds this guideline. N1 vibration levels above this guideline are generally accompanied by perceivable airframe vibrations. Waiting until N1 peak vibration approaches or exceeds the 5.0 unit limit may require multiple fan trim balances to bring N1 vibration down to an acceptable limit.

NOTE: 5.0 Units (aircraft display)= 1.5 IPS

2 Aircraft/FCOM correlation.

As stated in the FCOM, if N2 vibration during engine start exceeds limit, start should be aborted. Subsequent starts may be initiated without maintenance action for up to three start attempts.
The above limits and guidelines are stable (steady state) levels. Aircraft systems continually monitor vibration and as such may not be stable, therefore the aircraft level is advisory and not a limit. Vibration above the advisory level may or may not require maintenance action, as described in the FCOM; initially depending on icing condition or other engine parameter shifts and finally whether the advisory level is confirmed at steady state conditions.

(4) Maintenance action after an unwanted and sudden shutdown of the engine:
(a) If the engine does not have damage after which engine removal is necessary, immediately do again an engine start.
(b) If there is engine damage such as component seizure or rupture (Ref. AMM TASK 05-51-26-200-001). This task includes the engine removal and a detailed inspection of the engine pylon.

[Rev.10 from 2021] 2026.04.01 12:55:55 UTC