A. Aircraft Maintenance Configuration
(1)
Make sure that the access platform is in position at the access door 824 in zone 128.
(2)
Make sure that the access door 824 is open.
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B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU EIS/GPWS/115VAC 3WZ P07 121VU EIS/GPWS/28VDC 2WZ P06
4. Procedure
_________
(Ref. Fig. 401/TASK 34-48-34-991-001)
Subtask 34-48-34-420-050
A. Installation of the GPWC
(1)
Clean the component interface and/or the adjacent area.
(2)
Do an inspection of the component interface and/or the adjacent area.
(3)
Remove the blanking caps from the electrical connectors (2).
(4)
Make sure that the electrical connectors (2) are clean and in the correct condition.
(5)
Install the GPWC (1) on its rack (3).
(6)
Push the GPWC (1) on its rack (3) to connect the electrical connectors (2).
(7) Engage the nut (4) on the lug (5) and tighten.
Subtask 34-48-34-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 3WZ, 2WZ
R **ON A/C 001-049, 051-060, 101-104,
Subtask 34-48-34-710-050
C. Do the operational test of the GPWS (Ref. TASK 34-48-00-710-001).
1EFF : ALL 1 34-48-34Page 405 1 1 May 01/05 1 1 1CES 1 1EFF : ALL 1 34-48-34Page 406 1 1 May 01/05 1 1 1CES 1 DME - DESCRIPTION AND OPERATION
**ON A/C ALL
R Post SB 34-1189 For A/C 001-049,051-060,101-104,
Subtask 34-48-34-710-050-A
C. Do the operational test of the Enhanced GPWS (Ref. TASK 34-48-00-710-001).
R R R NOTE : We recommande to make sure that the version of the Terrain____ Database which is loaded in the Enhanced GPWC is the latest available one (Refer to SIL 34-080).
Subtask 34-48-34-610-050
D. If the Enhanced GPWS has not the last updated database, do the loading of the Enhanced GPWC Data Base (Ref. TASK 34-48-00-610-001) at the next maintenance opportunity.
**ON A/C ALL
5. Close-up________
Subtask 34-48-34-860-051
A. Make sure that the work area is clean and clear of tool(s) and other items.
Subtask 34-48-34-410-050
B. Close Access
(1) Close the access door 824 (Ref. TASK 52-41-00-410-002).
(2) Remove the access platform(s).
_______________________________
1. General
_______
The Distance Measuring Equipment (DME) is a radio aid to medium range
navigation which provides the crew with :
-a digital readout of the slant range distance of the aircraft from a selected ground station
-audio signals which identify the selected ground station.
The DME uses the frequency band from 962 MHz to 1213 MHz for reception and
transmission.
2. Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------2SD1 INTRG-DME, 1 81VU 127 824 34-51-33 2SD2 INTRG-DME, 2 82VU 128 824 34-51-33 3SD1 ANTENNA-DME, 1 121 NONE 34-51-11 3SD2 ANTENNA-DME, 2 NONE 127 NONE 34-51-11
3. System Description
__________________
R **ON A/C 001-049, 101-105, 151-199,
A. Principle
-
The principle of the DME navigation is based on the measurement of the transmission time. Paired interrogation pulses go from an onboard interrogator to a selected ground station. After 50 microseconds, the station transmits the reply pulses to the aircraft.
-
The measurement of time between transmitting the interrogation pulses and receiving the reply pulses is a function of the slant range distance of the aircraft to the ground station. The measurement value is converted into nautical miles and shown to the crew.
-
The interrogation frequencies vary from 1025 to 1150 MHz. The reply frequencies vary from 962 to 1213 MHz.
