Airworthiness Directive · Amendment 39-13910 · Great Lakes Aircraft Company, LLC, Models 2T-1A-1 and 2T-1A-2 Airplanes
Great Lakes Aircraft Company, LLC, Models 2T-1A-1 and 2T-1A-2 Airplanes
This AD affects all Model 2T-1A-1 and 2T-1A-2 airplanes that have a Lycoming IO-360-B1F6, AIO-360-B1G6, or AEIO-360-B1G6 engine installed and are certificated in any category.
The FAA supersedes Airworthiness Directive (AD) 79-20-08, which applies to all Great Lakes Aircraft Company, LLC, (Great Lakes) Models 2T-1A-1 and 2T-1A-2 airplanes with a Lycoming IO-360-B1F6 or AIO-360-B1G6 engine installed. AD 79-20-08 currently requires you to inspect the engine induction system and the alternate air door for any signs of damage and repairing or replacing any damaged components. AD 79-20-08 also requires you to inspect the induction system for the presence of a drain fitting. If the drain fitting is blocked, restricted, or does not exist, AD 79-20-08 requires you to clear the fitting or drill a hole in the elbow at the fitting location. This AD is the result of the FAA inadvertently omitting Lycoming engine AEIO- 360-B1G6 from the applicability section of AD 79-20-08. Consequently, this AD retains the actions required in AD 79-20-08 and adds Lycoming engine AEIO-360-B1G6 to the applicability section. We are issuing this AD to prevent the aircraft induction system from becoming blocked or restricted, which could result in engine failure. This failure could lead to loss of control of the airplane.
To address this problem, you must do the following:
| Actions | Compliance | Procedures |
|---|---|---|
| (1) Perform the following: (i) Visually inspect the aircraft induction system drain fitting located in the induction elbow below the fuel injector for blockage or restriction. (ii) If the hole is blocked or restricted in the weld area or not drilled through the elbow, open up the restricted hole or drill a hole in the elbow at the fitting location using a No. 10 (.193) drill. | For all affected airplanes: Inspect within the next 25 hours time-in-service (TIS) after January 28, 2005 (the effective date of this AD). Before further flight, modify the blocked or restricted aircraft induction system drain fitting | Not applicable. |
| (2) Visually inspect the alternate air door for distortion, heat damage, and cracks. If any damage is found, repair or fabricate a new door following Figure 1, Figure 2, and Figure 3 in this AD | For airplanes previously affected by AD 79-20-08: Initially inspect at the next scheduled inspection required by AD 79-20-08 or within the next 25 hours TIS after January 28, 2005 (the effective date of this AD), whichever occurs later. Repetitively inspect thereafter at intervals not to exceed 100 hours TIS. For airplanes not previously affected by AD 79-20-08: Inspect within the next 25 hours TIS after January 28, 2005 (the effective date of this AD). Repetitively inspect thereafter at intervals not to exceed 100 hours TIS. For all affected airplanes: After each inspection, if damage is found during any inspection, before further flight, repair, replace the damaged alternate air door | Not applicable. |
| (3) Visually inspect the aircraft induction system for cleanliness of the air filter, distortion, security, and damage from backfire or induction system fire. If the air filter is dirty, if any distortion, damage, or lack of security is found, repair, replace or modify all affected components | For airplanes previously affected by AD 79-20-08: Initially inspect at the next scheduled inspection required by AD 79-20-08 or within the next 25 hours TIS after January 28, 2005 (the effective date of this AD), whichever occurs later. Repetitively inspect thereafter at intervals not to exceed 100 hours TIS. For airplanes not previously affected by AD 79-20-08: Inspect within the next 25 hours TIS after January 28, 2005 (the effective date of this AD). Repetitively inspect thereafter at intervals not to exceed 100 hours TIS. For all affected airplanes: After each inspection, if damage is found during any inspection, before further flight, repair, replace or modify any damaged components | Not applicabale. |
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.
