AD 82-16-12

82-16-12 BELL: Amendment 39-4431. Applies to Bell Model 206 helicopters with Chadwick C-22 Auxiliary Fuel System installed per Supplemental Type Certificate SH139WE.

Compliance is required as indicated.

To provide early warning of auxiliary fuel transfer pump malfunction and the associated decrease in usable auxiliary fuel, accomplish the following, unless already accomplished:

1. Within 30 days after the effective date of this AD, install a placard, in accordance with Chadwick Service Bulletin 20-81-01 dated October 6, 1981, or FAA approved equivalent limiting usable auxiliary fuel to half the amount in the auxiliary tanks at takeoff.

2. Within 300 hours time-in-service or 6 months from the effective date of this AD, whichever occurs first, install the C-22-FM Flow Monitoring Kit in accordance with Chadwick Service Bulletin 20-81-01 dated October 6, 1981, or FAA approved equivalent. The placard installed per item 1 above may be removed, provided the revisedFlight Manual Supplement, Chadwick Auxiliary Fuel System C-22, dated October 21, 1981, is incorporated in the Rotorcraft Flight Manual.

3. Alternate modifications or other actions which provide an equivalent level of safety may be used when approved by the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Mountain Region.

4. Special flight permits may be issued in accordance with Federal Aviation Regulation Part 21, Sections 21.197 and 21.199 to operate each helicopter to a base for the accomplishment of the modification required by this AD.

This amendment becomes effective September 1, 1982.