Loss of the MKR Data on the PFD

TASK 34-55-00-810-815-A
Loss of the MKR Data on the PFD

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-63-00-810-851-A	Loss of the VOR 1 Output Bus by the DMC 1
TSM TASK 31-63-00-810-859-A	Loss of the VOR 1 Output Bus by the DMC 2
TSM TASK 34-55-00-810-801-A	Failure of the VOR/MKR Receiver 1
TSM TASK 34-55-00-810-803-A	Loss of the VOR 1 Data Bus Identified by the EIS 1
TSM TASK 34-55-00-810-804-A	Loss of the VOR 1 Data Bus Identified by the EIS 2
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-004	EIS System Test
AMM 34-55-00-720-001	Functional Test of the VOR/MKR
AMM 34-55-00-740-002	BITE Test of the VOR/MKR
ASM 345501
AMM 34-55-18-000-001	Removal of the Marker Antenna
AMM 34-55-18-400-001	Installation of the Marker Antenna
AMM 34-55-31-000-001	Removal of the VOR/MKR Receiver
AMM 34-55-31-400-001	Installation of the VOR/MKR Receiver

3. Fault Confirmation
Subtask 34-55-00-720-058-A

A. Test
(1) Do the operational test of the VOR/MKR (Test of the MKR reception and identification) AMM 34-55-00-720-001.

4. Fault Isolation
Subtask 34-55-00-810-072-A

A. If the MKR data do not come into view on the F/O PFD only:

Subtask 34-55-00-810-073-A

B. If the MKR data do not come into view on the CAPT PFD only:

Subtask 34-55-00-810-074-A ** ON A/C NOT FOR ALL

C. If the MKR data do not come into view on the F/O PFD and on the CAPT PFD:

(1) If the BITE test gives the maintenance message VOR 1 RECEIVER:

(2) If the BITE test does not give the maintenance message VOR 1 RECEIVER:

(a) If the EIS input test gives the maintenance message DMC 1 : NO VOR 1 DATA or DMC 2 : NO VOR 1 DATA:

(b) If the EIS input test does not give a maintenance message:

1 If the fault continues:

a If the fault continues:

do a check and repair the wiring from the MARKER antenna (1RS) to the VOR/MKR receiver 1 (3RS1) ASM 345501.

Subtask 34-55-00-810-074-B ** ON A/C NOT FOR ALL

C. If the MKR data do not come into view on the F/O PFD and on the CAPT PFD:

(1) If the BITE test gives the maintenance message VOR 1 RECEIVER:

(2) If the BITE test does not give the maintenance message VOR 1 RECEIVER:

(a) If the EIS system test gives the maintenance message DMC 1 : NO VOR 1 DATA or DMC 2 : NO VOR 1 DATA:

(b) If the EIS system test does not give a maintenance message:

1 If the fault continues:

a If the fault continues:

Do a check and repair the wiring from the MARKER antenna (1RS) to the VOR/MKR receiver 1 (3RS1) ASM 345501.

Subtask 34-55-00-720-059-A

D. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:30 UTC