COOLING - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The power plant cooling system consists of:

cooling of the nacelle compartments
cooling of the aircraft and engine accessories
cooling of engine parts (HPT, LPT)

A. Nacelle Compartment Cooling
The nacelle is divided in three major areas

the engine air inlet
fan compartment
core compartment.

The last two compartments only are cooled to fulfil the following functions:

(1) Sufficient airflow to offset the effects of engine case heat rejection and engine flange air leakage thereby maintaining an acceptable compartment temperature level.

(2) Cooling of temperature critical components.

(3) Cowling pressure load limiting in the event of pneumatic duct failures.

(4) Ventilation of compartment during engine shutdown.

(5) Ventilation of combustible fluid vapors to preclude fires.

B. Aircraft and Engine Accessories Cooling
The nacelle installation is designed to provide cooling and ventilation air for engine accessories mounted on the fan and core casing.
The distribution and circulation of the air in the compartments is such that the limit for specific components is not exceeded.

C. Cooling of Engine Parts
Differents parts of the IAE V2500 engine are cooled by air bled in the primary flow (HP turbine cooling), and secondary flow (HPT/LPT ACC).

** ON A/C NOT FOR ALL

2. Location of Components

A. Location of HP Turbine Cooling System

HP Turbine Cooling System Location ** ON A/C NOT FOR ALL

B. Location of HP/LP Turbine Active Clearance Control System

LPT/HPT Active Clearance Control System Location ** ON A/C NOT FOR ALL

[Rev.10 from 2021] 2026.04.01 03:11:01 UTC