AD 2024-22251

Published 2024-09-30 · 8 models · 117 US-registered tails affected · Federal Register

Airworthiness Directives; THOMMEN AIRCRAFT EQUIPMENT AG Digital Air Data Computers Federal Register ↗

Abstract

The FAA proposes to adopt a new airworthiness directive (AD) for certain THOMMEN AIRCRAFT EQUIPMENT AG (THOMMEN) AC32 Digital Air Data Computers. This proposed AD results from occurrences of AC32 Digital Air Data Computers (ADCs) that stop functioning below certain temperatures. This proposed AD would require replacing an affected AC32 Digital ADC with a serviceable part. The FAA is proposing this AD to address the unsafe condition on these products.

Applicability · by US fleet size

BELL 212 TCDS H4SW 54 tails
BELL 412EP TCDS H4SW 24 tails
BELL 222 TCDS H9SW 15 tails
BELL 412 TCDS H4SW 12 tails
BELL HELICOPTER TEXTRON 212 TCDS H4SW 5 tails
LEONARDO S P A A109S 3 tails
AIRBUS HELICOPTERS AS332L1 TCDS H4EU 3 tails
GULFSTREAM AEROSPACE 550 1 tails

Federal Register text

Verbatim; the Federal Register publication is the legally binding document. Cite: 89 FR 79480. View on Federal Register ↗

[Federal Register Volume 89, Number 189 (Monday, September 30, 2024)] [Proposed Rules] [Pages 79480-79483] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2024-22251]

-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-2322; Project Identifier MCAI-2024-00065-Q] RIN 2120-AA64

Airworthiness Directives; THOMMEN AIRCRAFT EQUIPMENT AG Digital Air Data Computers

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

-----------------------------------------------------------------------

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD) for certain THOMMEN AIRCRAFT EQUIPMENT AG (THOMMEN) AC32 Digital Air Data Computers. This proposed AD results from occurrences of AC32 Digital Air Data Computers (ADCs) that stop functioning below certain temperatures. This proposed AD would require replacing an affected AC32 Digital ADC with a serviceable part. The FAA is proposing this AD to address the unsafe condition on these products.

DATES: The FAA must receive comments on this NPRM by November 14, 2024.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: Federal eRulemaking Portal: Go to regulations.gov. Follow the instructions for submitting comments. Fax: (202) 493-2251. Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590. Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. AD Docket: You may examine the AD docket at regulations.gov under Docket No. FAA-2024-2322; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, the mandatory continuing airworthiness information (MCAI), any comments received, and other information. The street address for Docket Operations is listed above. Material Incorporated by Reference: For THOMMEN AIRCRAFT EQUIPMENT material identified in this proposed AD, contact THOMMEN AIRCRAFT EQUIPMENT AG, Hofackerstrasse 48, 4132 Muttenz, Switzerland; phone: +41 (0) 61 965 22 22; email: [email protected]; website: thommen.aero. You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO 64106. For information on the availability of this material at the FAA, call (817) 222-5110.

FOR FURTHER INFORMATION CONTACT: William Reisenauer, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (516) 228-7301; email: [email protected].