switch -SHORT.
(2) Pilot’s HOOK EMER REL button -Press and hold.
Change 2 4-33
CARGO HOOK
NORMAL RLSE
SWITCH
CREWMEMBER’S CARGO HOOK CONTROL PENDANT
AA0368
SA
Figure 4-16. Crewmember’s Cargo Hook Control Pendant
(3)
CARGO HOOK TEST light -On.
(4)
HOOK EMER REL button -Release. TEST light off.
(5)
Repeat steps (2) through (4) for copi-lot’s HOOK EMER REL button, and crewmember’s cargo hook control pendant EMER RLSE button.
b. Open test.
(1)
CARGO HOOK EMERG REL switch -OPEN.
(2)
Pilot’s HOOK EMER REL button -Press and hold.
(3)
CARGO HOOK TEST light -On.
(4)
HOOK EMER REL button -Release. TEST light off.
(5)
Repeat steps (2) through (4) for copi-lot’s HOOK EMER REL button, and crewmember’s cargo hook control pendant EMER RLSE button.
3. CARGO HOOK EMERG REL switch NORM. If the cargo hook is not to be used immediately after completing the circuit test check, the EMERG REL switch shall remain at OPEN until ready for load pickup.
4.7.4.2 Emergency Release.
NOTE
When the emergency hook release has been used and a replacement squib (explosive car-tridge) is not available, the hook can not be used until the explosive device is replaced, since the hook load beam will not close and lock.
Emergency release of an external cargo load is done by an electrically-.red explosive cartridge, initiated from ei-ther of the collective stick grip switches, marked HOOK EMER REL, or the crewman’s cargo hook control pen-dant, marked EMER RLSE. The emergency release is used when the electrical and manual releases are inoperative, and the load must be jettisoned. With the CARGO HOOK EMERG REL switch at NORM, power will be applied to the emergency release switch. Pressing the switch applies 28 vdc to the explosive cartridge, producing a high gas pressure to drive a piston in the lock assembly, releasing the load arm lock. The weight of the load will cause the load arm to open. Once the emergency release is used, the hook will remain open and the CARGO HOOK OPEN advisory legend will remain on until the explosive cartridge device is replaced. When the explosive cartridge device is replaced the load arm will close, the light will go off, and the emergency release mode is returned to operation. Power to operate the emergency release system is from the dc essential bus through a circuit breaker, marked CARGO HOOK EMER.
4.7.5 Pre.ight. When cargo hook loads are to be car-ried, checks within this paragraph and procedures of para-
graphs 4.7.6, 4.7.7, 4.7.8 and 4.7.9 apply.
1.
Cargo hook -Check condition, security and ex-plosive cartridge installed.
2.
Emergency release system -Check. (Go to-paragraph 4.7.4.)
3.
Manual release -Check. (Go to paragraph 4.7.3.3.)
4.7.6 Before Takeoff.
1. CARGO HOOK EMERG REL switch -NORM.
2. CARGO HOOK ARMING switch -ARMED.
4.7.7 Emergency Release Procedure.
Pilot or copilot HOOK EMER REL or crew-man’s control pendant EMER RLSE -Press.
4.7.8 In-.ight Procedures.
Cargo suspended from the cargo hook should not be over a 30° cone angle. To prevent damage to the cargo hook keeper, the pilot shall use extreme care to prevent placing load pressure on the keeper.
CARGO HOOK ARMING switch -As required. ARMED for low altitude/low airspeed. SAFE at cruise al-titude and airspeed.
4.7.9 Before Landing. CARGO HOOK ARMING switch -ARMED.
Section IV MISSION FLEXIBLE SYSTEMS
4.8 MISSION READINESS CIRCUIT BREAKER PANEL.
The mission readiness circuit breaker panel (Figure 2-18) is on the No. 1 electrical junction box in the cabin, and contains all required circuit breakers for mission equip-ment. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：UH-60Q 直升机技术手册 直升机操作手册 1(137)
