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Airworthiness Directive

AD 99-21-22 64 FR 55409 Active

Federal Aviation Administration · 14 CFR part 39

Requires a visual inspection to detect corrosion of the shear decks and ribs of the left and right stub wings; follow-on corrective actions, if necessary; and drilling of new drain holes in the lower shear decks.

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FR document
99-26277
Amendment
39-11367
Published
1999-10-13
Effective
1999-11-17
Models covered
1

Last live check: 2026-10-04

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AD

99-21-22

FR doc 99-26277 · 64 FR 55409

AD 99-21-22Published 1999-10-13Effective 1999-11-17

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires a visual inspection to detect corrosion of the shear decks and ribs of the left and right stub wings; follow-on corrective actions, if necessary; and drilling of new drain holes in the lower shear decks.

Full official abstract

This amendment adopts a new airworthiness directive (AD), applicable to all Short Brothers Model SD3-30, SD3-60, SD3 SHERPA, and SD3-60 SHERPA series airplanes, that requires a visual inspection to detect corrosion of the shear decks and ribs of the left and right stub wings; follow-on corrective actions, if necessary; and drilling of new drain holes in the lower shear decks. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent corrosion of the stub wing shear decks and ribs, which could result in cracking or failure of the stub wing structure.

More directives for Shorts SD3-30 / SD3-60

  1. AD 2010-24-06 Airworthiness Directives; Short Brothers PLC Model SD3 Airplanes Effective 2011-02-16
  2. AD 2008-16-09 R1 Airworthiness Directives; Short Brothers Model SD3-60 Airplanes Effective 2009-09-16
  3. AD 2008-16-09 Airworthiness Directives; Short Brothers Model SD3-60 Airplanes Effective 2008-09-15
  4. AD 2008-12-08 Airworthiness Directives; Short Brothers Model SD3-60 Airplanes Equipped... Effective 2008-07-15
  5. AD 2007-08-09 Airworthiness Directives; Short Brothers Model SD3-60 SHERPA, SD3-SHERPA... Effective 2007-05-08

All Shorts SD3-30 / SD3-60 directives

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Applies to 1 model in our index