Document ID: chunk:federal_register_of_legislation:F2006L01448:body:0:p1
Version: federal_register_of_legislation:F2006L01448
Segment Type: other
Provision Reference: 
Character Range: 0–3112

AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Brantly B-2 Series Helicopters
AD/B-2/32  Tail Rotor Gearbox  7/2006 TX

Applicability:  Brantly Helicopter, Inc. Model B-2, B-2A, and B-2B helicopters, serial number 2001 and larger, with a vertical shaft (shaft), part number (P/N) 249-10, or any serial-numbered helicopter with a shaft, P/N 249-10, that was purchased after 1994.
Requirement:       1. To detect fatigue cracking of the shaft and prevent failure of the shaft and subsequent loss of control of the helicopter, accomplish the following:

                     (a) Remove the tail rotor vertical gearbox (gearbox), P/N 278- 200; shaft, P/N 249-10; vertical shaft housing (housing), P/N 249-3; and the intermediate gearbox bushing (bushing), P/N 252-4, from the helicopter.

                     (b) Inspect the flange retainer, part number (P/N) 15-17, located at the top of the shaft housing for deformation and measure the inside diameter.  Replace the flange retainer with an airworthy flange retainer if the part is deformed or if the inside diameter is not 1.5050 to 1.5060 inches, before further flight.

                     (c) Inspect the housing, P/N 249-3, for deformation and measure the outer diameter at each end and at the centre of its span.

                     Replace the housing with an airworthy housing, before further flight if:

                        (i) The housing is deformed;

                        (ii) Any outer diameter not on the flared end is not 1.497 to 1.500 inches; or

                        (iii) The outer diameter of the flared end is not 1.844 to 1.875 inches.

                     (d) Inspect the bushing, P/N 252-4, for nicks or scoring, and measure the bushing's length.  If the length of the bushing is not .292 to .302 inch or if nicks or scoring is found, replace the bushing with an airworthy bushing, before further flight.

                     (e) Inspect the bevel pinion gear (gear), P/N 15-8, paying particular attention to the bore, for nicks, scoring, burrs, or misalignment.  Measure the diameter of the bolt hole and the bore.  Replace the gear with an airworthy gear before further flight if:

                        (i)You find misalignment,

                        (ii) You cannot remove all nicks, scoring, or burrs with light hand polishing using Scotch Brite (maroon or white) and maintain all tolerances and a 32 root mean square (rms) finish,

                        (iii) The diameter