Document ID: chunk:federal_register_of_legislation:F2006B06185:body:0
Version: federal_register_of_legislation:F2006B06185
Segment Type: other
Provision Reference: 
Character Range: 0–1485

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Propellers - Variable Pitch - Hoffman

AD/PHOF/1 Blade Pitch Change Fork - Replacement 5/83

            Applicability: All Hoffman variable pitch Model HO-V123 series propellers fitted to Lycoming Model 0-540 and IO-540 series engines.

 Requirement: Required action:

(a)     The forks and the pitch change blocks are to be exchanged in accordance with instructions given in overhaul manual E 105 by an appropriately approved organisation.

Part                                          Old P/No.  New P/No.
Pitch change fork                             VP 20-747  VP 20-909
Pitch change block, symetric alternatively    VP 20-554  VP 20-912
Pitch change block, unsymmetrical             VP-20-550  VP 20-908

(b)     Mark modified propellers with 4 mm high letters "SB 3" above the manufacturing year.

            Note: German A.D. Luftfahrt-Bundesamt 63-303-61-83-29 refers.

 Compliance: Part 1: All models fitted to aerobatic certificated aircraft, by 31st July, 1983.

            Part 2: All other models by the next reconditioning inspection or 30th November, 1983 whichever is the sooner.

            Background:  The manufacturer advises that reports have been received of cracked pitch change forks particularly on aerobatic certificated aircraft, consequently a stronger designed pitch change fork has been introduced.