Loss of One or More VHF Transmission/Reception Functions, or Noise on One or More VHF Channel.

TASK 23-12-00-810-827-A
Loss of One or More VHF Transmission/Reception Functions, or Noise on One or More VHF Channel.

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 23-12-00-810-813-A	Loss of the VHF 1 Transmission
TSM TASK 23-12-00-810-814-A	Loss of the VHF 1 Reception
TSM TASK 23-12-00-810-815-A	Loss of the VHF 2 Transmission
TSM TASK 23-12-00-810-816-A	Loss of the VHF 2 Reception
AMM 23-12-00-710-001	Operational Test of the VHF System
AMM 27-92-41-000-010	Removal of the Radio PTT Switch
AMM 27-92-41-400-010	Installation of the Radio PTT Switch

3. Fault Confirmation
Subtask 23-12-00-710-074-A

A. Test
(1) Do the operational test of the VHF system AMM 23-12-00-710-001.

4. Fault Isolation

NOTE: Electromagnetic interference from the Passenger Entertainment System (PES) can cause unsatisfactory reception on one or more VHF channels.

Subtask 23-12-00-810-082-A

A. The transmission function is not possible during the operational test of the VHF 1/VHF 2 system:

(1) If the reception function is not possible during the operational test of the VHF1/VHF 2 system:

(a) If the fault continues and if the Captain does a report of the event:

Replace SW-RAD PTT, CAPT [11RN] on the Captain's side stick AMM 27-92-41-000-010 AMM 27-92-41-400-010.

(b) If the fault continues and if the First Officer does a report of the event:

Replace SW-RAD PTT, F/O [12RN] on the First Officer's side stick AMM 27-92-41-000-010 AMM 27-92-41-400-010.

Subtask 23-12-00-710-075-A

B. Do the operational test of the VHF system AMM 23-12-00-710-001.

[Rev.8 from Aug 2018] 2026.04.04 04:25:38 UTC