70-06-04 BRITTEN NORMAN, LTD: Amdt. 39-951. Applies to Models BN-2 and BN-2A airplanes having serial numbers C19 through C130 which have modification NB/M/155 incorporated.
To ensure the security of the locking keys in the outboard side of the four wing to fuselage attachment spindles, accomplish the following:
(a) Within 10 hours' time in service after the effective date of this AD, unless already accomplished, remove the four access panels W11, W14, W33, and W36 from the upper surface of the wing center section and visually inspect to ensure that the waisted locking key in each of the four attachment spindles is in position and is tightly retained there by the outboard face of the plain nut.
(b) If any movement or incorrect positioning of any locking key is evident during the inspection required by paragraph (a), before further flight re-secure the affected locking key in accordance with Britten-Norman Service Bulletin No. BN-2/SB.25, dated January 8, 1970, or later ARB issue or an FAA-approved equivalent.
This amendment becomes effective March 17, 1970.