Commonwealth legislation

AD/T-28/1 - Horizontal Tailplane

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Directive requires owners/operators of North American T-28 series aeroplanes that do not have tailplane reinforcement TO 1T-28-569 (marked 'D-10') to inspect and, if necessary, repair the horizontal tailplane structure and the forward tailplane-to-fuselage attachment for cracks. It mandates removal of specified panels for visual inspection (a borescope may be used) and that access openings be refitted before return to service.

Inspections are due within 5 hours time-in-service or by 20 June 1996, then every 50 hours or 1 year. The action follows reports of cracking and a manufacturer recommendation to strengthen tailplanes.

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/T-28/1 - Horizontal Tailplane.

AD/T-28/1 - Horizontal Tailplane

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
North American Aviation T-28 Series Aeroplanes

AD/T-28/1 Horizontal Tailplane 4/96

Applicability: All T-28 series aircraft which do not have tailplane reinforcement TO 1T-28-569 incorporated.

Note: Reinforced tailplanes will have ‘D-10’ marked on the tailplane data plate.

Requirement: 1. Remove the elevator and outboard ends of the horizontal tailplane. Visually inspect the aft face of the forward spar and all ribs between the forward and rear spar for signs of cracks. A flexible borescope may be used to assist access.

Inspect both inboard and outboard faces of each rib. Refit or repair all access openings in the tailplane before returning the aircraft to service.

Remove fairings, as required, to gain access to the forward horizontal tailplane to fuselage attachment fitting. Visually inspect the attachment fitting for cracks or working rivets. Refit fairings before returning the aircraft to service.

Compliance: 1. Inspect in accordance with Requirements 1 and 2 before 5 hours time in service after 28 March 1996, or before 20 June 1996, whichever occurs first. Re-inspect at intervals not to exceed 50 hours time in service or 1 year, whichever occurs first.

Background: The Warbirds Maintenance Review Board has received a report of a T-28 aircraft with cracks in the tailplane ribs and forward tailplane attachment fitting. The Board has recommended issue of a Directive to inspect unmodified tailplanes on Australian registered T-28 aircraft for similar cracks.

The T-28 aircraft has a history of horizontal tailplane failures. Investigation of the failures by the manufacturer has shown that the design standard in use at the time may not meet applied service loads. The manufacturer has recommended that all tailplanes are strengthened to meet a later design standard. When details of the modification are received this Directive may be amended accordingly. It has been reported that the aircraft found with cracks had not been modified.

Source text

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

1 AD/T-28/1 - Horizontal Tailplane