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Thu, Sep 20, 2018

AD: Learjet, Inc. Airplanes

AD NUMBER: 2018-19-04

PRODUCT: Certain Learjet, Inc. Models 28, 29, 31, 31A, 35, 35A, 36, 36A, 55, 55B, 55C, and 60 airplanes.

ACTION: Final Rule.

SUMMARY:  This AD was prompted by fatigue cracks initiating in the flap support structure due to repetitive flap loads, which has caused flap nose roller support bracket failure.

This AD requires replacement of the flap nose roller fitting, nose roller support bracket, and adjacent rib support structure with improved components.

DATES: This AD is effective October 23, 2018.

COST: The FAA estimates that this AD affects 706 airplanes of U.S. registry. The cost of compliance is estimated as follows:

  • Replacement of flap nose roller fitting, nose roller support bracket, and adjacent rib support structure with improved components - 188 work-hours × $85 per hour = $15,980. Parts - $12,213. Total cost per operator - $28,193.
FMI: AD

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