Commonwealth legislation

AD/SD3-60/24 - Propeller Blade Model M10876K

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive requires operators of Shorts SD3-60 aircraft fitted with Hartzell M10876K propeller blades to carry out recurring inspections of the blade internal bearing hole per Hartzell Service Bulletin 136D and to retire all M10876K blades by 31 March 1988. It responds to observed shank cracks linked to corrosion pits and one blade separation (Background); the inspection timetable uses flight-hour and flight-count thresholds and imposes inspection, replacement and downtime costs on aircraft operators.

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/SD3-60/24 - Propeller Blade Model M10876K.

AD/SD3-60/24 - Propeller Blade Model M10876K

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Short SD3-60 Series Aeroplanes

AD/SD3-60/24 Propeller Blade Model M10876K 11/87

Applicability: All Shorts SD3-60 aircraft fitted with Hartzell Model HC-B5HP-3( )/M10876K propellers.

Requirement: Action in accordance with Shorts SD3-60 Service Bulletin No SD360-61-06.

Note: Hartzell Service Bulletin No 154 refers.

Compliance: (i) Blades with 0 to 3000 hours time in service since new will require inspection of the blade internal bearing hole in accordance with Hartzell Service Bulletin 136D prior to completing 3000 hours total time in service.

(ii) For blades in excess of 3000 hours time in service and which have accumulated in excess of 300 flights since the last inspection in accordance with Hartzell Service Bulletin 136D are required to be reinspected in accordance with Hartzell Service Bulletin 136D prior to accumulating an additional 100 flights.

(iii) Blades which have accumulated less than 300 flights are required to be reinspected in accordance with Hartzell Service Bulletin 136D at 300 flights or the accumulation of 100 additional flights from 24 August 1987 whichever is the greater.

(iv) Following completion of initial inspection as required by sub-paras (i), (ii) or (iii), as applicable, all blades must be inspected in accordance with Hartzell Service Bulletin 136D at each and every subsequent 300 flight interval until retired from service.

(v) All model M10876K blades are to be retired from service by 31 March 1988.

Background: There have been a limited number of M10876K blade shank cracks with one blade separating from an aircraft. Cause of the shank crack appears to be related to minor corrosion pits located in the blade internal bearing hole. Blade bearing hole corrosion has already been addressed by Hartzell Service Bulletin 136D. A replacement blade M10876ASK will be available from mid-August 1987.

Source text

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

1 AD/SD3-60/24 - Propeller Blade Model M10876K