Commonwealth legislation

AD/CHA/12 Amdt 1 - Wing Ribs

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This directive requires owners/operators of specified American Champion (Aeronca/Bellanca) 8KCAB aeroplanes to inspect wing ribs adjacent to the front spar for cracks, buckling or loose fabric rivets. It directs removing fabric over the doped-on lower reinforcing rings and using a flashlight and mirror to inspect from the first rib outboard of the fuel tank through the aileron area, focusing about 2 inches aft of the front spar.

Defects must be repaired under a Secretary‑approved scheme before further flight. Inspection intervals: 50 hours (normal) and 10 hours (acrobatics). (Applicability; Requirement; Compliance)

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/CHA/12 Amdt 1 - Wing Ribs.

AD/CHA/12 Amdt 1 - Wing Ribs

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
American Champion (Aeronca, Bellanca) Series Aeroplanes

AD/CHA/12

Amdt 1

Wing Ribs 10/79

Applicability: All model 8KCAB with S/Nos. 3-70, 4-71, 5-72, 7-72 to 53-72, 54-73 to 119-73 and 120-74 to 159-74 except those which have incorporated Bellanca Kit No 243.

Requirement: Visually inspect the wing ribs for evidence of cracks and/or buckling of the rib flanges as follows:

(a) Remove the fabric from each of the four doped-on reinforcing rings located on the lower surface of each wing adjacent to the front spar.

(b) Using a flashlight and mirror inspect all ribs from the first rib outboard of fuel tank and continue through aileron area to last outboard full rib.

(c) Examine area approximately 2" aft of front spar (just aft of the rib reinforcement gusset) on the rib top flange for evidence of cracks, distortion and fabric rivet looseness.

If cracks, distortion or loose fabric rivets are found as a result of the inspection, all damaged ribs are to be repaired to a scheme approved by the Secretary before further flight.

Compliance: At intervals not exceeding 50 hours time in service for normal flight and 10 hours time in service for acrobatic flight.

Source text

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

1 AD/CHA/12 Amdt 1 - Wing Ribs