TM 55-1510-221-CL
8.
If the light is still illuminated after 30 seconds: Left bleed air valve switch - OPEN.
9.
Right bleed air valve switch - ENVIRO OFF.
10.
If the light is still illuminated after 30 seconds: Right bleed air valve switch - OPEN.
ICE VANE FAILURE
1.
Airspeed - 160 KIAS or below.
2.
Ice vane control circuit breaker - Pull.
3.
Ice vane - Operate manually.
4.
Airspeed - Resume normal airspeed.
ENGINE BLEED AIR SYSTEM FAILURE
BLEED AIR FAILURE LIGHT ILLUMINATED
1.
Brake de-ice switch - OFF.
2.
TGT and torque - Monitor (note readings).
3.
Bleed air valve switch - PNEU & ENVIRO OFF.
4.
Cabin pressurization - Check.
EXCESSIVE DIFFERENTIAL PRESSURE
1.
Cabin altitude and rate-of-climb controller - Select higher setting.
2.
If condition persists: LEFT BLEED AIR VALVE switch - ENVIRO OFF (light illuminated).
3.
If condition still persists: RIGHT BLEED AIR VALVE switch - ENVIRO OFF (light illuminated).
4.
If condition still persists - Descend immediately.
5.
If unable to descend: CABIN PRESS DUMP switch - CABIN PRESS DUMP.
6.
Bleed air valve switches - OPEN, if cabin heating is required.
E-6
