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Equipment & Furnishings
Cabin interior, cargo restraint and emergency equipment including slides, rafts and the ELT.
Equipment & furnishings — summary notes
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- ATA 25 covers the cabin interior — seats and restraints, galleys, lavatories, cargo linings and cargo-restraint systems — all certified for strength (e.g. 16 g seats), flammability and crashworthiness.
- EMERGENCY equipment lives here: escape slides and slide/rafts, life rafts and jackets, portable oxygen and fire extinguishers, first-aid kits, megaphones and flashlights.
- The EMERGENCY LOCATOR TRANSMITTER (ELT) transmits a distress signal on 406 MHz (with 121.5 MHz homing) to the Cospas-Sarsat satellite system, activated by impact g or manually.
- Cargo restraint (rollers, locks, nets) holds loads against flight and crash loads; floor-proximity emergency escape-path lighting guides occupants to exits in smoke.
- For the B2 technician the ELT, emergency lighting and any electrically-operated cabin equipment are the relevant parts.
- ⚠ Exam trap: escape slides, life rafts and the ELT are ATA 25 emergency equipment; the modern ELT transmits on 406 MHz to satellites (121.5 MHz is only a local homing signal).
Solved examples
On what frequency does a modern ELT alert the search-and-rescue system, and how is the aircraft finally located?
A modern ELT transmits a coded digital distress signal on 406 MHz, which is picked up by the Cospas-Sarsat satellite constellation; the message can carry the aircraft identity and, if GPS-equipped, its position. Rescuers then home in on the aircraft using the ELT's lower-power 121.5 MHz signal for the final localisation.
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