Engine Start Procedure after Engine Cold Soak (with OAT below -40 DEG.C (-40 DEG.F))

TASK 12-31-70-660-002-A
Engine Start Procedure after Engine Cold Soak (with OAT below -40 DEG.C (-40 DEG.F))

CAUTION: TO PREVENT THERMAL SHOCK ON ENGINE PARTS, SLOWLY INCREASE THE AIR TEMPERATURE (UP TO 30 DEG.C/86 DEG.F MAXIMUM) AND FLOW RATE OF THE HOT BLOWER, IN ORDER TO SLOWLY WARM-UP THE COMPONENTS/STRUCTURE.

1. Reason for the Job
This procedure provides instructions to dispatch the engine with Outside Air Temperature (OAT) from -40 DEG.C (40 DEG.F) to -46 DEG.C (-50.8 DEG.F).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	HOT AIR BLOWER MAX OPERATING 55DEG C (131 DEG F)
98D20003002000	2	BLANKET,ENGINE-HOT AIR

B. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-003-A	Engine Start in Cold Weather Conditions (OAT Less Than -40 Degrees)

3. Job Set-up
Subtask 12-31-70-660-051-A ** ON A/C NOT FOR ALL

A. Recommendations
(1) Refer to the Engine Start in cold Weather Conditions precautions (Ref. AMM TASK 71-00-00-860-003).
(2) Make sure that you use the fuel applicable for cold weather condition per Flight Crew Operating Manuel (FCOM) requirement (FCOM LIM-28).

4. Procedure
Subtask 12-31-70-880-050-A ** ON A/C NOT FOR ALL

A. Powerplant Preheating
(1) Install 98D20003002000 BLANKET,ENGINE-HOT AIR around the nacelle.
(2) Blow hot air at maximum 30 DEG.C (86.00 DEG.F) inside the 98D20003002000 BLANKET,ENGINE-HOT AIR with a HOT AIR BLOWER MAX OPERATING 55DEG C (131 DEG F) until Integrated Drive Generator (IDG) oil temperature is above -25 DEG.C (-13.00 DEG.F).
(3) Remove 98D20003002000 BLANKET,ENGINE-HOT AIR from the nacelle.

Subtask 12-31-70-710-053-A ** ON A/C NOT FOR ALL

B. Engine Start
(1) Engine Start Procedure
(a) Start the engine in Cold Weather Conditions (Ref. AMM TASK 71-00-00-860-003)

[Rev.10 from 2021] 2026.04.02 06:10:35 UTC