|preamble attached >>>||
ADs updated daily at www.Tdata.com
BELL HELICOPTER TEXTRON CANADA LIMITED: (
e m e r g e n c y )
Product Identifier 2018-SW-058-AD.
(a) APPLICABILITY This AD applies to Model 429 helicopters certificated in any category. (b) UNSAFE CONDITION This AD defines the unsafe condition as a loose tail rotor (T/R) gear- box support attachment point. This condition could result in detach- ment of the T/R gearbox, loss of T/R control, and loss of control of the helicopter. (c) EFFECTIVE DATE This AD is effective upon receipt. (d) AFFECTED ADS This AD replaces Emergency AD 2018-15-51. (e) COMPLIANCE You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accom- plished prior to that time. (f) REQUIRED ACTIONS (1) Before further flight, inspect for looseness of the T/R gearbox in- stallation to the T/R gearbox structural support by moving the T/R gearbox output shaft in an upward and downward direction. If the T/R gearbox installation is loose, before further flight, complete the actions required by paragraphs (f)(2)(i) and (ii) of this AD. (2) Within 5 hours time-in-service, unless already completed as required by paragraph (f)(1) of this AD: (i) Visually inspect the T/R gearbox retaining hardware and each support attachment point area for evidence of fretting, a crack, and incorrect installation. If there is any evidence of fretting, a crack, or in- correct installation, before further flight, repair in accordance with FAA-approved procedures. (ii) Inspect each T/R gearbox retaining nut by applying 160 in-lbs (19 Nm) of torque. If the torque of a T/R gearbox retaining nut is below 160 in-lbs (19 Nm), before further flight: (A) Remove the T/R gearbox and inspect each stud for proper staking, each stud thread for uniformity, each mounting surface for evidence of fretting and cracking and each mounting hole for elongation. If a stud is not properly staked, a stud thread is not uniform, a mounting sur- face has evidence of fretting or cracking, or a mount hole is elon- gated, before further flight, replace the affected parts or repair in accordance with FAA-approved procedures. (B) Replace each nut with nut part number NAS9926-6L and apply a torque of 160 in-lbs. (g) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS) (1) The Manager, Safety Management Section, Rotorcraft Standards Branch, FAA, may approve AMOCs for this Emergency AD. Send your proposal to: Matt Fuller, Senior Aviation Safety Engineer, Safety Management Section, Rotorcraft Standards Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177;telephone (817) 222-5110;email 9-ASW-FTW-AMOC-Requests @faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC. (h) ADDITIONAL INFORMATION (1) For further information contact: Matt Fuller, Senior Aviation Safety Engineer, Safety Management Section, Rotorcraft Standards Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone (817) 222-5110; email firstname.lastname@example.org. (2) For a copy of the service information referenced in this emergency AD, contact Bell Helicopter Textron Canada Limited, 12,800 Rue de l’Avenir Mirabel, Quebec J7J1R4; telephone (450) 437-2862 or (800) 363-8023; fax (450) 433-0272; or at http://www.bellcustomer.com/files/. (3) The subject of this emergency AD is addressed in Transport Canada AD No. CF-2018-18, dated July 11, 2018. (i) SUBJECT Joint Aircraft Service Component (JASC) Code 6520, Tail Rotor Gearbox. Issued in Fort Worth, Texas, on July 26, 2018. Scott A Horn, Deputy Direc- tor for Regulatory Operations, Compliance & Airworthiness Division, Air- craft Certification Service.
DATE: July 26, 2018
This superseding Emergency Airworthiness
Directive (AD) 2018-16-51 is being sent to owners and operators of Bell
Helicopter Textron Canada Limited (Bell) Model 429 helicopters.