HYDRAULIC SYSTEM REMAINS PRESSURIZED (HYD PRESS ON ADVISORY LIGHT REMAINS ON AFTER SYSTEM CYCLE IS COMPLETED)
Indicates that the hydraulic system is pressurized. The white HYD PRESS ON advisory light will illuminate normally when the speed brakes, landing gear or flaps are in transit or the thrust attenuators are being stowed. If the HYD PRESS ON light remains on after a cycle of one of these systems is complete or illuminates at any other time, action must be taken to preclude damage to the hydraulic system.
NOTE
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During normal operation thrust attenuators may occasionally creep out slightly from the stow position resulting in a brief pressurization of the hydraulic system. No action should be taken unless the MASTER CAUTION is illuminated.
IF NOT DUE TO NORMAL SYSTEM OPERATION
1. Last System Used - RECYCLE (speed brakes, landing gear, flaps, or thrust attenuators).
2. Speed Brake Control Circuit Breaker - PULL.
3. Landing Gear Control Circuit Breaker - PULL.
4. Flap Control Circuit Breaker - PULL.
5. Thrust Attenuator(s) Circuit Breaker - PULL.
IF SYSTEM DEPRESSURIZED
6. Circuit Breakers - RESET (one at a time). Leave pulled circuit breaker which caused system to depressurize.
7. LAND AS SOON AS PRACTICAL. Reset Circuit Breaker pulled, prior to landing.
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WARNING: IF THE THRUST ATTENUATOR CIRCUIT BREAKER(S) IS PULLED, THE THRUST ATTENUATOR MAY UNLOCK. DO NOT SLOW AIRSPEED BELOW STICK SHAKER SPEED.
IF SYSTEM REMAINS PRESSURIZED (Indicates bypass valve failed)
6. Control Circuit Breakers - RESET (one at a time).
7. LAND AS SOON AS POSSIBLE. If system bypass valve fails, the hydraulic system may overheat.