Home Random Page


CATEGORIES:

BiologyChemistryConstructionCultureEcologyEconomyElectronicsFinanceGeographyHistoryInformaticsLawMathematicsMechanicsMedicineOtherPedagogyPhilosophyPhysicsPolicyPsychologySociologySportTourism






General Description

These are the TCAS components:

· TCAS directional antennas (2)

· TCAS computer

· ATC/TCAS control panel.

TCAS interfaces with these other system components:

· ATC transponders (2)

· Landing gear lever

· PSEU

· Common display system (CDS) display electronic units

(DEUs) (2)

· Remote electronics unit (REU)

· Radio altimeters (2)

· Ground proximity warning computer (GPWC)

· Weather radar

· Left air data inertial reference unit (ADIRU)

· Suppression coax tees

· Flight data acquisition unit (FDAU).

 

ATC/TCAS control panel

The dual ATC/TCAS control panel controls the ATC transponder and the TCAS computer.

These are the ATC controls and displays on the ATC/TCAS control panel:

- Transponder select switch

- Active system display

- Transponder code selectors

- Four digit identification code

- Transponder mode selector

- IDENT switch

- Altitiude source switch

- Fail light.

See THE TCAS section for more information on TCAS controls. (SECTION 34-45).

 

The transponder select switch is a two-position switch used to select ATC transponder 1 or ATC transponder 2 as the active transponder. When the flight crew selects the 1 position, the control panel sends a ground standby/on discrete to transponder 2 only. Transponder 2 is in standby. Transponder 1 is active.

When the flight crew selects the 2 position, the control panel sends an open standby/on discrete to transponder 2 to make it active. A ground standby/on discrete goes to transponder 1 and an antenna transfer discrete goes to the ATC coax switches.

This puts transponder 1 in standby and makes the relays connect the ATC antennas to transponder 2.

The selected ATC system shows on the LCD active system display.

 

Identification Code Display and Selection.

The flight crew uses the code selectors to set the four digits of the identification code. The four digits show on the liquid crystal display (LCD). Codes are from 0000 to 7777, with 4096 different selections.

 

CAUTION: DO NOT SELECT CODES 7500, 7600 OR 7700. THESE CODES ARE USED ONLY FOR EMERGENCIES.

 

Transponder Mode Selector.

The transponder mode selector has several positions. These are the functions that the ATC system uses:

- TEST - This push button on the top of the mode selector starts an ATC transponder functional test.

- STBY (standby) - A ground discrete goes to both transponders. This ground discrete prevents operation of the transponder, but does not prevent built-in-test-equipment

(BITE) functions.

- ALT RPTG OFF (altitude reporting off) - The active transponder responds to ATC interrogations. The reply does not contain an altitude report.

- XPNDR (transponder) - The active transponder responds to ATC interrogations. Mode C and Mode S altitude replies contain altitude information.

 

You use the function select switch to select one of these TCAS modes:

- TA ONLY mode. This is the TA only mode. The display of RAs is prevented.



- TA/RA mode. The displays show all targets. This is the normal mode of operation for TCAS.

 

IDENT Switch.

When the ATC controller requests the airplane identifier, the flight crew pushes the momentary IDENT switch. The transponder adds a special position identification (SPI) pulse to the interrogation reply for the next 18 seconds.

 


Date: 2016-03-03; view: 917


<== previous page | next page ==>
 | Altitude Source Switch.
doclecture.net - lectures - 2014-2024 year. Copyright infringement or personal data (0.007 sec.)