69-24-05 KOLLSMAN: Amdt. 39-880. Applies to Kollsman Type A4086910021, A4186910028 and A4186910029 Altimeters.
Unless already accomplished, compliance is required within 900 hours time in service after the effective date of this AD, or the next overhaul of the altimeter, which ever occurs first. In order to remove the source of a false signal, alter the altimeters in accordance with either:
(a) Kollsman Service Bulletin 188, Rev. 1, dated December 19, 1968, or Service Bulletin 189, dated October 29, 1968, or
(b) An equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
This amendment is effective December 4, 1969.