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727 RVSM

Altitude Alerter P/N: 9D-80310-34 Digital Air Data Computer P/N: 9B-81020-1 Digital Air Data Computer P/N: 9B-81020-1 Pilot's Altimeter P/N: 9D-80110-35 Copilot's Air Data Display Unit P/N: 9D-80130-22

Click on the components above for more information.

 

B727 RVSM Compliant Single DADC Configuration
ASM P/N K5586-0000-XX

Although the single DADC configuration was designed with the B727-100 aircraft in mind, it can also be installed in a B727-200 aircraft as well. The following Innovative Solutions and Support (IS&S) RVSM compliant components make up the single DADC configuration:

• One DADC (replaces existing air data computer)
• One Repeater Electric Altimeter (replaces the existing Captain’s altimeter)
• One Air Data Display Unit (replaces the existing First Officer’s Altimeter)
• One Altitude Alerter (replaces the existing altitude alerter)

The DADC provides altitude information for the Captain’s altimeter, the altitude alerter, both transponders and can provide altitude and airspeed data for the autopilot, both flight directors, FMS/GPS, TAWS/GPWS and the DFDR.

The Captain’s repeater altimeter is an all-electric altimeter and provides the DADC with baro corrected altitude information via an RS232 serial bus. This baro corrected altitude information is outputted on the DADC’s ARINC 429 bus.

The Air Data Display Unit (ADDU) acts as a mini air data computer as well as the First Officer’s altimeter. The ADDU provides digital air data information (ARINC 429) for the mode S transponder, altitude alerter and if required for a second FMS/GPS. The ADDU can also supply Gillham code altitude information for a mode C transponder.

The altitude alerter receives baro corrected altitude information on a 429 data bus from the ADDU and the DADC. The 429 data is toggled between the ADDU and the DADC via the “DADS 1-2” source select switch. The altitude alerter also has an integral pressure sensor that allows it to display cabin altitude and depending upon aircraft configuration can also display static air temperature (SAT).

There are several different installation kits for the single DADC configuration. Once the existing aircraft data has been reviewed and any special requests have been submitted, ASM will select the kit that bests fits the aircraft to be modified. The installation kit consists of the following:

• STC Data Package (STC cover sheet, Airplane Flight Manual Supplement, E.O. etc..)
• All required wire harnesses and connectors.
• DADC tray and connector (if required).
• DADS 1-2 source select switch.
• All necessary relays, relay brackets, wire clamps, various hardware etc..

 

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