Airworthiness Directive · Amendment 39-15605 · Lockheed Model 382, 382B, 382E, 382F, 382G, and 382J Series Airplanes
Lockheed Model 382, 382B, 382E, 382F, 382G, and 382J Series Airplanes
This AD applies to all Lockheed Model 382, 382B, 382E, 382F, 382G, and 382J series airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all Lockheed Model 382, 382B, 382E, 382F, 382G, and 382J series airplanes. This AD requires, among other actions, an inspection to determine whether a certain upper engine mount bolt is installed, and replacement of any discrepant upper engine mount bolt with a new one. This AD results from a report indicating that several upper engine mount bolts manufactured by a certain supplier broke during installation. We are issuing this AD to prevent failure of the upper engine mount bolts, which could result in reduced structural capability of an engine mount, and possible separation of a strut and engine from the airplane during flight.
Comply with this AD within the compliance times specified, unless already done.
Within 10 days after the effective date of this AD do the actions specified in paragraphs (f)(1), (f)(2), and (f)(3) of this AD.
(1) Make the airplane safe for maintenance in accordance with a method approved by the Manager, Atlanta Aircraft Certification Office (ACO), FAA. Chapter 71-00 of the Lockheed Hercules Maintenance Manual is one approved method.
(2) Gain access to the upper engine mount bolts by opening the left and right cowling doors on each engine.
(3) Inspect the visible surface head of each bolt in the upper position of each upper engine mount to determine whether part number (P/N) “NAS 636” is stamped across the top, and whether the manufacturer's code “AFC” or “A” (i.e., AirFasco) is stamped across the bottom. All other manufacturers' codes are acceptable.
If any upper position bolt, P/N NAS 636, having “AFC” or “A” stamped across the bottom of the surface head is found during the inspection required by paragraph (f)(3) of this AD, before further flight, replace that bolt with a new bolt, P/N NAS 636, having a manufacturers' code other than “AFC” or “A,” in accordance with a method approved by the Manager, Atlanta ACO, FAA. One approved method is the following: To replace an engine mount bolt without removing an engine, do the actions specified in paragraphs (g)(1) through (g)(8) of this AD. If both bolts in the upper position of an engine mount must be replaced, the replacements must be done one at a time to prevent alignment problems.
(1) Shut down and disconnect external electrical power in accordance with a method approved by the Manager, Atlanta ACO, FAA. Chapter 24-40 of the Lockheed Hercules Maintenance Manual is one approved method.
(2) Attach a warning tag and close the external power receptacle door.
(3) Install the nacelle hoist sling on the power package.
(4) Lift the nacelle hoist sling enough to take up load. Warning: When “NO-LOADING” an engine with the sling, the intention is to transfer most of the weight of the engine from the airplane to the sling. This requires some judgment on the part of the technician. Under no circumstances should the sling be raised enough to lift the airplane.
(5) Remove the discrepant upper engine mount bolt and washer.
(6) Install the new upper engine mount bolt, P/N NAS 636, having a manufacturers' code other than “AFC” or “A,” and washer, and torque to between 308 and 458 foot-pounds (3,700 to 5,500 inch-pounds).
(7) Remove the nacelle hoist sling from the power package.
(8) Once all discrepant bolts in the upper position of each upper engine mount have been replaced, restore the airplane to service in accordance with a method approved by the Manager, Atlanta ACO, FAA. Chapter 71-00 of the Lockheed Hercules Maintenance Manual is one approved method.
Note 1: It is the intent of the actions specified in paragraph (g) of this AD to allow replacement of individual upper engine mount bolts without having to do any other maintenance.
As of the effective date of this AD, no person may install a bolt, P/N NAS 636, having “AFC” or “A” stamped across the bottom of the surface head, in the upper position of any upper engine mount, on any airplane.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
