AD 69-19-03

69-19-03 DOWTY ROTOL: Amdt. 39-837. Applies to Dowty Rotol Propellers Type Nos. (c) R.130/4-20-4/12E and (c) R.148/4-20-4/21E installed on British Aircraft Corporation (Vickers) Viscount 744 and 745D airplanes.

Compliance required as indicated, unless already accomplished.

(a) For Type No. (c) R.130/4-20-4/12E propellers installed on Model 745D, Viscount airplanes and for Type No. (c) R.148/4-20-4/21E propellers installed on Model 744 Viscount airplanes, accomplish the following:

(1) For propellers having hubs with 15,000 or more hours' time in service on the effective date of this AD, accomplish the inspection required by paragraph (3) of this section within the next 400 hours' time in service after the effective date of this AD, or before 3,000 hours' time in service since the last inspection, whichever occurs later. Thereafter, repeat this inspection at intervals not to exceed 3,000 hours' time in service from the last inspection.

(2) For propellers having hubs with less than 15,000 hours' time in service on the effective date of this AD, accomplish the inspection required by paragraph (3) of this section before 3,000 hours' time in service has accumulated since the last inspection, or before the accumulation of a total of 15,400 hours' time in service, whichever occurs later. Thereafter, repeat this inspection at intervals not to exceed 3,000 hours' time in service from the last inspection.

(3) Inspect the hub arm threads including binocular inspection and crack testing in accordance with Dowty Rotol Limited Service Bulletin No. 61-608, Revision 1, dated June 1968, or later ARB-approved issue, or an FAA-approved equivalent method. If cracked threads are detected during any inspection, before further flight, replace the propeller hub with a serviceable part of the same part number.

(b) For Hub and Driving Center Assembly P/Nos. RA.48546, RA.59601, and RA.59602 installed on propellers having serial numbers listed in paragraph (c) accomplish the following:

(1) Remove from service all hub and driving center assemblies having 20,000 or more hours' time in service on the effective date of this AD within the next 400 hours' time in service after the effective date of this AD.

(2) Remove from service all hub and driving center assemblies having less than 20,000 hours' time in service on the effective date of this AD, within the next 400 hours' time in service after the effective date of this AD, or upon the accumulation of a total of 20,000 hours time in service, whichever occurs later.

(c) Propeller Serial Numbers

DRG.12/61 99241 99381 99568 99749 102071 DRG.13/61 99244 99386 99573 99752 102073 DRG.15/61 99266 99388 99575 99754 102148 574 99267 99395 99577 99759 102149 5733 99268 99396 99578 99766 102152 57265 99269 99397 99579 99771 102166 57268 99270 99399 99580 99772 102167 98338 99272 99403 99587 99784 102168 99180 99275 99405 99594 99791 102170 99186 99276 99407 99596 99800 102184 99187 99278 99409 99597 99804 102257 99190 99281 99410 99600 100024 102259 99191 99283 99411 99603 100025 102349 99198 99284 99413 99606 100040 102489 99207 99323 99417 99609 101579

99211 99330 99427 99613 101584

99217 99337 99429 99614 101586

99218 99339 99434 99615 101804

99220 99341 99437 99617 101929

99221 99352 99440 99620 101985

99222 99353 99443 99621 101986

99224 99368 99468 99741 101987

99231 99369 99472 99742 102041

99235 99375 99546 99743 102046

99239 99377 99557 99745 102052

(d) For hub and driving center assembly having P/Nos. listed in paragraph (e), accomplish the following:

(1) Remove from service all hub and driving center assemblies having 30,000 or more hours' time in service on the effective date of this AD, within the next 400 hours' time in service after the effective date of this AD.

(2) Remove from service all hub and driving assemblies having less than 30,000 hours' time in service on the effective date of this AD within the next 400 hours' time in service after the effective date of this AD, or upon the accumulation of a total of 30,000 hours' time in service, whichever occurs later.

(e) Hub and Driving Center Assembly Part Numbers

RA41744 RA47436 RA44761 RA47436/2 RA44761/1 RA47436/4 RA44761/2 RA47592 RA44761/3 RA48546 RA44761/4 RA49557 RA44761/5 RA56345 RA45155 RA58184 RA45155/1 RA59601 RA45155/2 RA59602

This amendment becomes effective October 6, 1969.