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727 RVSM

Digital Air Data Computer P/N: 9B-81020-1Digital Air Data Computer P/N: 9B-81020-1Digital Air Data Computer P/N: 9B-81020-1Digital Air Data Computer P/N: 9B-81020-1Pilot's Altimeter P/N: 9D-80110-35Pilot's Altimeter P/N: 9D-80110-35Altitude Alerter P/N: 9D-80310-34

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B727 RVSM Dual DADC Configuration
ASM P/N K5582-0000-00

The IS&S system includes two Altimeters, two Digital Air Data Computers and one Altitude Alerter.

NOTE:

ASM offers two (2) RVSM compliant STC configurations for the B727 series aircraft. One configuration utilizes a single DADC with a repeater altimeter in the Captain's instrument panel, an ADDU (Air Data Display Unit) for the F/O's altimeter and an altitude alerter. The altitude alerter does not incorporate an altitude preselect function. The second configuration utilizes dual DADCs with repeater altimeters for the Captain's and F/O's altitude indicators and an altitude alerter. The altitude alerter does not incorporate an altitude preselect function. Both configurations require that a standby pressure altimeter be available in the P1 or P2 instrument panel.

There are three (3) variants of Pitot/Static installations on the B727 series aircraft:

1. Aux pitot/static plumbing to the E/E bay only. This was the original B727 configuration. This is not a certifiable configuration for RVSM. At a minimum, Captain's pitot/static plumbing would need to be installed to the E/E bay to support the installation of a Digital Air Data Computer.

2. Captain's pitot/static plumbing to the E/E bay, for late model B727-100s and early B727-200s.
This configuration can use the ASM "single DADC and ADDU configuration".

3. Captain's and F/O's pitot/static plumbing to the E/E bay for B727-200s. This configuration can use the ASM "dual DADC configuration". Some of these aircraft are equipped with complete provisions for a second air data computer installation.

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