69-23-05 MESSERSCHMITT-BOLKOW Gmb.H.: Amdt. 39-873. Applies to Bolkow Model Bolkow Junior Aircraft, Serial Numbers 505 through 684.
Compliance is required as indicated unless already accomplished.
To prevent failures of the lower engine-mounting bolts within the next 100 hours' time in service after the effective date of this AD, replace the lower engine-mounting bolts P/N 298-21093.22 with new bolts P/N 208- 21093.22 in accordance with Messerschmitt-Bolkow Mounting Instructions No. 04/68, dated October, 1968, or an FAA-approved equivalent (Messerschmitt-Bolkow Service Bulletin No. 208-1/68, dated November 14, 1968, covers this same subject).
This amendment becomes effective December 11, 1969.