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Also, refer to aircraft manufacturer’s data (Type Approval or STC information) and/or national regulations regarding installation on helicopters.
There are few guidelines on installing an ELT in a helicopter. Manufacturers have traditionally advised installing the ELT at a 45 degree angle to help account for the unique flight characteristics of helicopters. TSO C91a and TSO C126 increased the sensitivity of the G-switch over the older TSO C91 requirements. Because of this, the 45 degree mounting angle, which tends to preload the G-switch, can result in increased “nuisance” activations from severe maneuvers, abrupt landings, etc.
 
Figure 15 - ME406P Helicopter Installation
 
 

 

10°

3. Registration

3.1 FAA Form 337

For most installations an FAA Form 337 will be required for registration. Additional information regarding the completion of FAA Form 337 can be found in Advisory Circular AC 43.9-1 (Instructions for Completion of FAA Form 337). AC 43-210 (Standardized Procedures for Requesting Field Approval of Data, Major Alterations and Repairs) provides further guidance.
Data used as a basis for approving major repairs or alterations for return to service must be FAA-approved prior to its use for that purpose and includes: FAR (e.g., airworthiness directives), ACs (e.g., AC 43.13-1 and 43.13-2 under certain circumstances), TSOs, parts manufacturing approval (PMA), FAA-approved manufacturer’s instructions, kits and service handbooks, type certificate data sheets and aircraft specifications. Other forms of approved data would be those approved by a designated engineering representative (DER), a manufacturer holding a delegation option authorization (DOA), STCs and, with certain limitations, previous FAA field approvals. 
Supporting data such as stress analyses, test reports, sketches, or photographs should be submitted with the FAA Form 337. The Artex Description, Operation, Installation and Maintenance Manual may be used as supporting data, however, it is not FAA approved data.
These supporting data will be returned to the applicant by the local FAA district office since only FAA Form 337 is retained as a part of the aircraft records at Oklahoma City.
3.2 Radio Station License

A Radio Station License is not required by the FCC for Emergency Locator Transmitters (ELTs). See the FCC web site at http://wireless.fcc.gov/aviation/fctsht4.html which states:
“On October 26, 1996, the FCC released a Report and Order in WT Docket No. 96-82, FCC 96-421 eliminating the individual licensing requirement for all aircraft operating domestically. This means that you do not need a license to operate a two-way VHF radio radar, or ELT aboard aircraft operating domestically. All other aircraft radio stations must be licensed by the FCC either individually or by fleet.”
 
FCC Form 605 which replaced FCC Form 404 in 1999 is not required for ELTs.
　
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