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NO 1 OR 1A HYD PRESS LIGHT (<1800psi)
- a. Turn off the respective pump; investigate. (B/MEDC, A/EMDC).
- Note: Gear retraction with one operable hydraulic pump may result in indication of hydraulic system failure and unsafe gear, due to heavy system demand.
- (T) Check Hyd Quantities.
- (T) Off duty FE check HSC, helmet on visor down, care in opening door. Use dipstick to check for leak. Smoke may be hydraulic leak - smells different then fire. Look for discoloration of the Hydraulic pump.
- (S) 380 F, phase-phase, phase-ground automatic shutoff.
- NO 2 HYD PRESS LIGHT (<1800psi)
a. Check No 2 system pressure. If low, secure No 2 pump.
- (T) Loss of one system, uncover boost handles.
- (T) Investigate as in No 1 Hyd Press light.
- (T) Discuss loss of control power: p. 10-1 flight characteristics
- In the event of failure of one hydraulic system, normal control is retained with up to one-half of the former capacity.
- (T) Approach flap landing, No aggressive maneuvering.
NO 1, 1A, or 2 HYD OIL HOT LIGHT ON (>175 F)
- a. Turn off respective pump.
- (T) Check fuel and hydraulic quantities.
- Investigate HSC.
- (C) Hydraulic oil temp is excessive, restricted coolant flow, not enough fuel in respective inboard fuel tank (min 1000 lbs)
- (T) Light, switch, CB, Bus, Component.
RUDDER POWER LIGHT ON (FLAPS UP)
- Actuate rudder pedals to deplete residual No. 2 hydraulic system pressure in rudder boost package. If light remains on:
- a. Check the rudder boost shutoff valve CB (MEDC)
- b. Turn off the No 2 Hyd pump. If the warning light goes out, the shutoff valve is inop. Turn No 2 hydraulic pump on and make no abrupt rudder movements.
- (T) If light stays on, turn No 2 pump back on. Probably a faulty pressure switch or light.
- (C) No 1 Hydraulic system pressure failure. Shutoff valve has opened.
- (T) If #1 system failure - turn off pumps to open SOV.
(S) Causes of RUDDER POWER light
- NO system pressure
- > 60% flaps - pressure in only ONE system.
- Loss of hyd system or SOV stuck closed.
- Try pulling K-13
- < 60% flaps - pressure in both systems.
- Rudder booster SOV open - lost power.
(T) LOW #1 SYSTEM HYDRAULIC QUANTITY
- 4.0 Normal in flight, service at 0.8 low. Cavitation at 2.0 (red arcs).
- Check pressures and quantities for both systems
- Perform a lights check - verify hyd lights operative
- If really low, uncover boost handles and turn off associated hyd system pumps.
- Check HSC for leaks.
- Can use emergency reservoir for extra hyd fluid - open star valve and pump without opening/closing bomb bay valve - should port to #1 system.
- Turn system pumps back on for approach and landing (maybe).
- May have to free-fall the gear and land without nosewheel steering.
When to BOOST OUT (T)
- 1. Lose or anticipated loss of all hydraulic pressure
- 2. Flight station controls seem immovable or require abnormally high force.
- 3. Aircraft noses up/down, rolls, yaws and application of pilot force to correct or stop condition is ineffective.
- Just boost out the surface that is effected. Say "Pull the [Elevator, Rudder, or Aileron] Boost handle" or you'll get all three.
DON'T BOOST OUT FOR:
- Trim Tab Problem - aircraft will respond to force on the primary flight control, however abnormally high forces may be required depending on position of malfunctioning tab. Boost out may result in serious control difficulties, control surface travel is reduced by 1/2.
- Autopilot Malfunction - Corrective action on control will be effective since autopilot can be overpowered.
- Binding Flight Control Cable - same characteristics as boost package malfunction. Ability to control will worsen with boost out. Obtain a safe altitude and be prepared to immediately go boost back on if situation worsens.
- Broken Control Cable - control moves freely with no effect. - Use autopilot and trim to fly. Have CP immobilize controls for input to the autopilot (pressure sensitive)