Airworthiness Directive · Amendment 39-14679 · Mitsubishi Heavy Industries MU-2B Series Airplanes
Mitsubishi Heavy Industries MU-2B Series Airplanes
This AD affects the following airplane models and serial numbers that are certificated in any category:
| Model | Serial No. |
|---|---|
| (1) MU-2B-26A and MU-2B-40 | 321SA, 348SA, 350SA through 419SA, 421SA, 422SA, and 423SA. |
| (2) MU-2B-36A and MU-2B-60 | 661SA, 697SA through 747SA, 749SA through 757SA, and 759SA through 773SA. |
The FAA adopts a new airworthiness directive (AD) for some Mitsubishi Heavy Industries (MHI) MU-2B series airplanes. This AD requires you to verify that the current flight idle blade angles are set at 12 degrees. If not already set at that angle, set the flight idle blade angles to 12 degrees. This AD results from a recent safety evaluation that used a data-driven approach to analyze the design, operation, and maintenance of the MU-2B series airplanes in order to determine their safety and define what steps, if any, are necessary for their safe operation. Part of that evaluation was the identification of unsafe conditions that exist or could develop on the affected type design airplanes. We are issuing this AD to prevent incorrect flight idle blade angle settings. This unsafe condition, if not corrected, could lead to an asymmetric thrust situation in certain flight conditions, which could result in airplane controllability problems.
To address this problem, you must do the following:
| Actions | Compliance | Procedures |
|---|---|---|
| Verify that the current flight idle blade angles are set at 12 degrees. If not already set to 12 degrees, set the flight idle blade angles to 12 degrees | Within the next 100 hours time-in-service after August 21, 2006 (the effective date of this AD) | Follow Mitsubishi Aircraft International, Inc. Service Bulletin No. SB016/61-001, dated March 18, 1980. |
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.
