Airworthiness directives › 2020-16-04
AD 2020-16-04 Airworthiness Directives; Pacific Aerospace Limited Airplanes
Makes named: pacific aerospace. Models named: 750XL. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Pacific Aerospace Limited Model 750XL airplanes, serial numbers 101 through to 215, 220, 8001, and 8002, certificated in any category.
Compliance
Unless already done, do the following actions in paragraphs (f)(1) and (2) of this AD. (1) Within 20 hours time-in-service after September 2, 2020 (the effective date of this AD), inspect the left hand (LH) and right hand (RH) flap screw jack assemblies for proper installation by following the Accomplishment Instructions, paragraphs A.1) through A.3), of Pacific Aerospace Mandatory Service Bulletin (MSB) PACSB/XL/117, Issue 2, dated August 21, 2019 (PACSB/XL/117, Issue 2). If a flap screw jack assembly is not properly installed as shown in figures 1 and 2 of PACSB/XL/117, Issue 2, before further flight, comply with the Accomplishment Instructions, Part B, of PACSB/XL/117, Issue 2. (2) As of September 2, 2020 (the effective date of this AD), do not install a LH flap screw jack assembly P/N 11-45621-1 or RH flap screw jack assembly P/N 11-45622-1 on any airplane, unless it is installed in accordance with the Accomplishment Instructions, Part B, of PACSB/XL/117, Issue 2.
Required actions
You may take credit for the actions required by paragraph (f)(1) of this AD if you performed those actions before the effective date of this AD using Pacific Aerospace MSB PACSB/XL/117, Issue 1, dated June 7, 2019.
Unsafe condition
This AD was prompted by an incorrect illustration of the screw jack assembly in the airplane maintenance manual, thus causing potential errors with installation. The FAA is issuing this AD to require an inspection of the flap screw jack assembly to verify proper configuration of the assembly and make the correction if found improperly installed. This unsafe condition, if not addressed, could cause fatigue failure of a flap screw jack, which could result in a failure of the flap actuator to fully extend the flaps during the completion of a final approach, a longer landing distance, and consequent runway overrun condition.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1