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Compliance required within eight months after the effective date of this AD, unless already accomplished.

To improve the crash survivability of the flight record, modify the Lockheed Aircraft Service Company flight recorder Models 109C and 109D as follows:

(a) On Model 109C serial numbers up to and including Serial Number 882 and Model 109D up to and including Serial Number 135, replace the tape cassette with a Lockheed Aircraft Service Company stainless steel cassette P/N 4024570-1.

This directive effective January 27, 1965.

Revise AD 65-1-3, Models 109C and 109D flight recorders, by deleting paragraph (b).

This amendment effective September 11, 1965.

Revise AD 65-1-3, Models 109C and 109D flight recorders, by:

1. Changing the compliance statement to read.

Compliance required as indicated, unless already accomplished.

2. Changing paragraph (a) to read:

(a) Within eight months after the effective date of Amendment 39-17 (29 F. R. 18477), on Model 109C, serial numbers up to and including Serial Number 882 and Model 109D up to and including Serial Number 135, replace the tape cassette with a Lockheed Aircraft Service Company stainless steel cassette P/N 4024570-1.