69-16-05 ALLISON: Amdt. 39-829. Applies to Model 250-C18 engines installed in Bell Model 206A Helicopters.
Compliance: Required as indicated.
To detect incipient engine failure, accomplish the following:
A) Effective immediately upon receipt of this Airworthiness Directive, inspect the lower gear box and the oil outlet magnetic plugs on a daily basis as described in Allison Commercial Service Letter 250 CSL No. 6, dated January 12, 1967. This inspection shall be performed at time intervals not to exceed five (5) hours' time in service.
B) On or before November 3, 1969, install a visual magnetic plug indicator as described in Bell Service Letter 206A-129, dated August 11, 1969, or later FAA approved revision or an equivalent installation approved by Chief, Engineering & Manufacturing Branch, FAA, Central Region.
C) When the installation described in Paragraph B of this Airworthiness Directive has been accomplished, the inspections required by Paragraph A of this Airworthiness Directive will no longer be required.
Effective August 13, 1969, revised August 30, 1969.