Commonwealth legislation

AD/SWSA226/83 - Wing Trailing Edge Ribs

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive requires owners/operators of specific Fairchild (Swearingen) SA226/227 serial numbers (Applicability) to inspect wing trailing‑edge ribs at the flap actuator attach brackets and, if clear, fit a reinforcement doubler or, if cracked, replace the rib assembly and fit the doubler as specified in Fairchild Service Bulletin 57‑016 (Requirement). Compliance is mandatory within 500 hours after 21 May 1998 (Compliance). Operators pay for the inspections, parts and replacements; the measure aims to prevent asymmetrical flap deflection from rib failure (Background).

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AD/SWSA226/83 - Wing Trailing Edge Ribs

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes

AD/SWSA226/83 Wing Trailing Edge Ribs 6/98

Applicability: Models Serial Numbers

SA226-TC TC201 through TC379

SA226-T T201 through T275, and T277 through T291 SA226-T(B) T(B)276, and T(B)292 through T(B)378 SA226-AT AT001 through AT069

Requirement: Inspect both wing trailing edge ribs at the centre flap actuator attach brackets, wing stations 98.385 and 100.635, for cracks in accordance with the Accomplishment Instructions section, Part A, of Fairchild Aircraft Service Bulletin (SB) 57-016, issued 25 June 1981, revised 9 December 1981.

If no cracks are found, install the reinforcement doubler, part number 27K36075-7, in accordance with the Accomplishment Instructions section, Part B of Fairchild SB 57- 016.

If any cracks are found, replace any cracked rib with a new rib assembly, part number 27-31085-1/2 or 27-31086-1/2, and install the new reinforcement doubler, part number 27K36075-7, in accordance with the Accomplishment Instructions section, Part B and Part C of Fairchild SB 57-016.

Note: FAA AD 98-04-05 Amdt 39-10318 refers.

Compliance: Unless already accomplished, within 500 hours time in service after 21 May 1998.

This airworthiness directive becomes effective on 21 May 1998.

Background: Fatigue cracking of the wing trailing edge ribs has been reported. Failure of a wing trailing edge rib could result in asymmetrical flap deflection with possible loss of control of the aircraft.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/SWSA226/83 - Wing Trailing Edge Ribs