3. Remove/Install the Alternate Air Valve
A. Remove the Alternate Air Valve
Detail Steps/Work Items Key Items/References
WARNING: DO NOT STAND WITHIN THE DANGER AREA OF THE PROPELLER IF THE ENGINE STARTS, THE PROPELLER CAN CAUSE DEATH OR INJURY TO PERSONS. WARNING: YOU MUST MAKE SURE THAT THE ENGINE IS SAFE BEFORE YOU DO WORK ON THE ENGINE CONTROLS. IF THE PROPELLER TURNS IT CAN CAUSE INJURY TO PERSONS.
(1) Make sure that the engine is safe: S Set the ignition switch to OFF. S Set the throttle control to IDLE. S Set the mixture control lever to LEAN CUT-OFF.
(2) Remove the engine cowlings. Refer to Section 71-10.
(3) Disconnect the airplane battery. Refer to Section 24-31.
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Detail Steps/Work Items Key Items/References
(4) Disconnect the spark plug cables from the spark plugs.
(5) Loosen the worm-drive clamp that holds the air filter to air filter housing.
(6) Pull the air filter forward and clear of the air filter housing.
(7) Release the alternate air control Bowden cable from the alternate air valve assembly: S Loosen the swivel fitting at the alternate air valve body. S Pull the Bowden cable wire end clear of the swivel fitting. S Remove and keep the swivel fitting. S Remove the retaining nut which holds the Bowden cable outer sheath in the support bracket at the alternate air valve spacer. S Move the Bowden cable clear of the alternate air valve.
(8) Remove the air filter housing and the alternate air valve: S Remove the 4 bolts which attach the air filter housing to the alternate air valve assembly. S Move the air filter housing and the alternate air valve assembly clear of the airplane. Support the air filter housing and the alternate air valve assembly. Remove and keep the spacers as you remove the bolts.
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AMM
B. Install the Alternate Air Valve
DA 40 Series
Detail Steps/Work Items Key Items/References
(1) Install the air filter housing onto the alternate air valve: S Install 4 new lock-washers onto the attaching bolts. S Install the 4 bolts into air filter housing. S Install the spacers onto the 4 attaching bolts. S Put the air filter assembly in position on the alternate air valve. Make sure that the spacer with the support bracket for the Bowden cable is correctly positioned Make sure that the bolts pass through the flange on the alternate air valve.
(2) Move the air filter housing and alternate air valve assembly into position on the airplane so that the attaching bolts align with the threaded holes in the fuel injector.
(3) Tighten the 4 attaching bolts.
(4) Install the alternate air Bowden cable: S Install the swivel onto the alternate air valve body. S Move the Bowden cable outer sheath into position in the support bracket at the alternate air valve. S Install the retaining nut which holds the Bowden cable outer sheath in the support bracket. S Push the Bowden cable wire end through the swivel fitting. S Tighten the swivel fitting.
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Detail Steps/Work Items Key Items/References 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：钻石40飞机维护手册 DA 40 SERIES AMM 5(37)
