Page 22 - June 2023

MAINTENANCE TIP
The Wing AD – Who, What and Where
by Dean Benedict
I’ve been getting a few calls lately about “the wing AD.” King Air owners want to know: Do I have to do it? And if so, where should I go? They are referring to the Federal Aviation Administration’s (FAA) Airworthiness Directive (AD) 91- 12-10, which applies only to certain King Air B200s and 300 models that were built in the mid-to-late 1980s.
The AD stipulates that somewhere between 8,300 and 9,500 hours of airframe time (depends on the King Air model), the wing bolt attach fittings must be modified using a specified kit. When the factory changed the lower forward wing bolts from “in tension” to “in shear,” they didn’t like the design of the spar attach points on certain King Air models and AD 91-12-10 was the result.
20 • KING AIR MAGAZINE
JUNE 2023