All speakers are TSO'd and approved by the FAA.
Four different models of TCAS speakers are available, three of which are approved by Boeing, and are installed on MD-11s, MD-717s, B-777s and B-767s.
P/N E4NA3F-1 (Boeing P/N BBN 7019-1)
- 4-inch, 4 Ohm voice coil, with enclosure, seprately-wired volume control.
- Installed in flight compartment overhead.
- Reproduces all communications, navigation and warning (TCAS, CAWS, and EGPWS) systems audio.
- Separate connector pins are provided to bypass volume control for TCAS and other warnings.
- Approved for use on B-717, MD-90, and MD-11.
P/N E4NA3F-3
- Essentially similar to P/N E4NA3F-1, except no volume control.
- Designed for warning system audio (TCAS, CAWS, and EGPWS).
P/N E4NA3GG-1
- 4-inch, two 14 Ohm voice coils, with enclosure, no volume control.
- Installed in flight compartment side console.
- Reproduces all communications, navigation and warnings (TCAS, CAWS, and EGPWS) systems audio. Second coil is used for predicted wind shear (PWS) warning.
- Approved for use on MD-90.
P/N 4A3E-2 (Boeing P/N S222W220-201)
- Dual channel with amplifier currently used on Boeing 777 and 767s.
- 600 Ohm input impedance.
- Channel one muting function.
- Channel one and channel two input isolation.
- Interfaces to flight interphone system, reproduces audio communication, and interfaces to warning systems audio.