(4)
Ground spoiler operation depends on the control valve, operated by the speed brake lever, and the interlock (shutoff) valve, operated by extension of the right main gear shock strut inner cylinder. Be sure these two valves are in the position required for the check being made.
2. Speed Brake Control System Trouble Shooting Chart
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SPEED BRAKE CONTROL SYSTEM - MAINTENANCE PRACTICES
1. General
A. Hydraulic systems A and B must be depressurized prior to performing maintenance on speed brake control system components. This is to prevent injury to personnel, resulting from inadvertent operation of the control system while maintenance is being performed. Care must be exercised to locate maintenance stands and items of ground equipment beyond the limits of control surface travel.
WARNING: PRESSURIZING THE SPEED BRAKE SYSTEM ALSO ACTIVATES FLAPS, SPOILERS, AILERONS, RUDDER, AND ELEVATOR HYDRAULIC SYSTEMS. ISOLATE AND TAG ALL FLIGHT CONTROL SYSTEMS NOT BEING TESTED AND ENSURE THAT ALL CONTROL SURFACES ARE CLEAR OF OBSTRUCTIONS AND PERSONNEL BEFORE APPLYING POWER.
B. When operating hydraulic system B pumps to pressurize hydraulic systems A and B, the following requirements must be observed:
(1)
At least 1675 pounds (761 kilograms) of fuel is required in the No. 2 fuel tank to provide hydraulic fluid cooling. On hot days, or when fuel temperature is known to be above 90°F (32.2°C), monitor the system B overheat indicator and switch pumps off when overheat is indicated.
(2)
Intermittent system B pump operation is limited to five starts of any one pump in a 5-minute period. Following the fifth start, run pump for at least 5 minutes or turn pump off for a minimum of 30 minutes.
C. The following procedure covers pressurization of hydraulic systems B and A through operation of electrical-driven hydraulic system B pumps only. Pressurization of hydraulic system A through operation of engine-driven hydraulic system A pumps is not covered.
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2. Speed Brake Hydraulic System A and B Pressurization
A. Equipment and Materials
(1) Lock Assembly - Ground, F72735
B. Pressurize speed brake hydraulic system A and B.
(1)
Connect electrical power to airplane.
(2)
Ensure that SPOILER SHUTOFF VALVES circuit breaker on P6 circuit breaker panel is closed.
(3)
Set parking brake and install ground lock assembly in nose gear.
(4)
Position GRD INTERCONNECT switch on forward overhead panel to OPEN.
(5)
Position No. 1 or 2 system B HYD PUMPS switches on forward overhead panel to ON.
(6)
Position SPOILER A and B switches on forward overhead panel to ON.
NOTE: To pressurize system A or system B separately, select system by appropriate positioning of SPOILER A and B switches.
C. Restore Airplane to Normal
NOTE: Perform the following steps after completing speed brake control system maintenance that required pressurization.
(1)
Position No. 1 and No. 2 system B HYD PUMPS switches to OFF.
(2)
Position GRD INTERCONNECT switch to CLOSE.
(3)
Remove electrical power.
(4)
Remove ground lock assembly.
3. Speed Brakes Hydraulic Systems A and B Depressurization
A. Equipment and Materials
(1) Lock Assembly - F80049-12 (Preferred), F80049-1 (Optional), (2 required)
B. Depressurize speed brakes hydraulic systems A and B.
(1) Position SPOILER A and B switches on forward overhead panel to OFF.
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G39049
543 Hydraulic Module Lock Installation
Feb 15/73 Figure 501 27-62-0
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