AD 78-11-08

78-11-08 BRITTEN NORMAN: Amendment 39-3219. Applies to Models BN-2A Islander and BN-2A Mark III Trislander series airplanes, certificated in all categories, that have not been modified in accordance with Britten-Norman Modification NB/M/929.

Compliance required as indicated, unless already accomplished.

To detect and prevent electrolytic corrosion of the elevator and flap control rods, accomplish the following in accordance with Britten-Norman Service Bulletin No. BN-2/SB.101, Issue 2, dated August 10, 1977, or an FAA-approved equivalent:

(a) Within the next 2 weeks after the effective date of this AD, and thereafter at intervals not to exceed 6 months, inspect the elevator and flap control rods at bonding clip attachment points for electrolytic corrosion.

(b) If during an inspection required by paragraph (a) of this AD corrosion is found, before further flight -

(1) Replace the control rod with a part of the same part number; or

(2) Clean the partuntil the metal is free of corrosion. However, if the metal cleaned from the control rod reduces the rod diameter in excess of 0.010 in., replace the control rod with a part of the same part number.

(c) The inspections required by this AD may be discontinued upon the replacement of the installed elevator and flap control rod untreated bonding clips with light alloy or cadmium coated clips in accordance with Britten-Norman Modification No. NB/M/929 or an FAA-approved equivalent.

(d) Airplanes may be flown in accordance with the requirements of FAR 21.197 and 21.199 to a base where the inspections and repairs required by this AD may be performed.

This amendment becomes effective June 6, 1978.