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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
AD 47-30-06

Airworthiness Directives; Beech Model AT-11 Airplanes


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47-30-06 BEECH: (Was Mandatory Note 2 of AD-2-582-2.) Applies Only to AT-11 Airplanes Equipped With M-3 Generators Which Do Not Have Three-Pole-Single-Throw Relays Installed for Generator Control.

To be accomplished prior to certification or, if certificated, on next periodic inspection but not later than October 1, 1947.

In accordance with Figure 1 install a three-pole-single-throw relay, General Electric No. CR2791-B100G3 or equivalent, for the control of each generator.



The operating coil of the left generator relay should be controlled by a single-pole-single- throw "ON-OFF" switch mounted on the pilot's control panel adjacent to the left battery switch, and should be labeled "LEFT GEN. SW.". The operating coil of the right generator relay should be controlled by a single-pole-single-throw "ON-OFF" switch mounted on the pilot's control panel adjacent to the right battery switch and should be labeled "RIGHT GEN. SW.". The battery and generator switches should be located adjacent to each other in the order shown on Figure 1, and should be provided with a suitable gangbar such that pilot can throw the four switches to the "OFF" position in a single operation.

The generator control relays may be mounted in any convenient junction box or in a separate box provided therefore. Choice of relay location should be such that the length of generator field leads are kept to a minimum.


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