Operational Test of the Two High Frequency (HF) System

TASK 23-11-00-710-002-A
Operational Test of the Two High Frequency (HF) System

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: DO NOT TRANSMIT WITH THE HF SYSTEM DURING REFUEL/DEFUEL OR TRANSFER OPERATIONS. TRANSMISSION WITH THE HF SYSTEM DURING THESE FUEL OPERATIONS CAN CAUSE INJURY AND/OR START A FIRE.

NOTE: During this test, the aircraft must be in an open area.

ZONE: 210

1. Reason for the Job
To do a check of the operation of the two HF systems.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)

3. Job Set-up
Subtask 23-11-00-860-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) On the front face of the HF transceivers:

Make sure that all the warning lights are off.

(3) On the Captain and First Officer jack panels:

Connect two boomsets.

Subtask 23-11-00-865-052-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/RMP/1	2RG1	G10
49VU	COM/AUDIO/ACP/F/O	5RN	G07
49VU	COM/ACP CAPT/SELCAL/INT 1 AUDIO/AVNCS	4RN	G06
49VU	HF1	1RE1	HA14
121VU	COM NAV/HF2	1RE2	L13
121VU	COM NAV/RMP/2	2RG2	L02
121VU	COM NAV/SELCAL	8RN	M04

Subtask 23-11-00-875-052-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/RMP/1	2RG1	G10
49VU	COM/AUDIO/ACP/F/O	5RN	G07
49VU	COM/ACP CAPT/SELCAL/INT 1 AUDIO/AVNCS	4RN	G06
49VU	HF1	1RE1	HA14
121VU	COM NAV/HF2	1RE2	L13
121VU	COM NAV/RMP/2	2RG2	L02
121VU	COM NAV/SELCAL	8RN	M04

4. Procedure

WARNING: OBEY THE RADIO REGULATIONS AND MAKE SURE THAT THE FREQUENCY IS AVAILABLE BEFORE YOU TRANSMIT.

CAUTION: IF THE TRANSCEIVER FAN DOES NOT OPERATE STOP THE TRANSMISSION IMMEDIATELY.

Subtask 23-11-00-710-052-C ** ON A/C NOT FOR ALL

A. Operational Test of the Two HF Systems (Reception)

ACTION	RESULT
1.On the RMP1:	On the RMP1:
Set the ON/OFF selector switch to ON.	The RMP shows the last frequencies and the last function used.
Push the HF1 pushbutton switch.	The green LED on this pushbutton switch comes on. The SEL indicator light (amber LED) comes on.
In the STBY/CRS display window, with the dual selector knob, set the frequency of a station that transmits.
Start this frequency. To do this, push the transfer pushbutton switch (double arrow) between the two display windows.	The frequency set comes into view in the left window.
2.On the RMP2:	On the RMP2:
Do the same procedure as for the RMP1, but set the HF2 system and a different frequency.	You must get the same results as in step 1.
3.On the Captain's ACP:	On the Captain's ACP:
Push the HF1 transmission pushbutton switch.	The green bars on the HF1 transmission pushbutton switch come on.
Push and release the HF1 reception pushbutton switch and turn it to the middle position.	The reception pushbutton switch moves fully out and comes on.
4.On the Captain's side stick controller:
Push and then release the radio PTT switch.	During the tuning (which continues for approximately 5 seconds), the reception stops and you can hear a 1000Hz signal in the Captain's boomset.
5.On the First Officer's ACP:	On the First Officer's ACP:
Push the HF2 transmission pushbutton switch.	The green bars on the HF2 transmission pushbutton switch come on.
Push and release the HF2 reception pushbutton switch and turn it to the middle position.	The reception pushbutton switch moves fully out and comes on.
6.On the First Officer's side stick controller:
Push and then release the radio PTT switch.	During the tuning (which continues for approximately 5 seconds), the reception stops and you can hear a 1000Hz signal in the First Officer's boomset.
7.On the panels 301VU and 500VU:
Turn the LOUDSPEAKER potentiometers clockwise.	Make sure that you hear the applicable reception: * HF1 system reception in the Captain's loudspeaker. * HF2 system reception in the First Officer's loudspeaker.

Subtask 23-11-00-710-053-C ** ON A/C NOT FOR ALL

B. Operational Test of the Two HF Systems (Transmission)

ACTION	RESULT
1.On the RMP1:	On the RMP1:
Set the ON/OFF selector switch to ON.	The RMP shows the last frequencies and the last function used.
Push the HF1 pushbutton switch.	The green LED on this pushbutton switch comes on. The SEL indicator light (amber LED) comes on.
In the STBY/CRS display window, with the dual selector knob, set the frequency of a station that transmits.
Start this frequency. To do this, push the transfer pushbutton switch (double arrow) between the two display windows.	The frequency set comes into view in the ACTIVE display window.
2.On the RMP2:	On the RMP2:
Do the same procedure as for the RMP1, but set the HF2 system and a different frequency.	You must get the same results as in Step 1.
3.On the Captain's ACP:	On the Captain's ACP:
Push the HF1 transmission pushbutton switch.	The green bars on the HF1 transmission pushbutton switch come on.
Push and release the HF1 and HF2 reception pushbutton switches and turn them to the middle position.	The reception pushbutton switches move fully out and come on.
4.On the First Officer's ACP:
Push the HF2 transmission pushbutton switch.	The green bars on the HF2 transmission pushbutton switch come on.
Push and release the HF1 and HF2 reception pushbutton switches and turn them to the middle position.	The reception pushbutton switches move fully out and come on.
5.On the panels 301VU and 500VU:
Turn the LOUDSPEAKER potentiometers clockwise.
6.On the Captain's side stick controller:
Push and then release the radio PTT switch.	During the tuning (which continues for approximately 5 seconds), the reception stops and you can hear a 1000Hz signal in the boomset.
7.On the Captain's and First Officer's side stick controllers:
Push and hold the radio PTT switch.	Make sure that the fan of the transceiver operates correctly.
Push and hold the radio PTT switches at the same time.	Make sure that there is no reception on the Captain and First Officer loudspeakers.
8.On the Captain's side stick controller:
Release the radio PTT switch while you hold the First Officer radio PTT switch pushed.	During the tuning (which continues for approximately 5 seconds), the reception stops and you can hear a 1000Hz signal in the First Officer boomset.
9.At the First Officer's station:
Transmit in HF2.	Make sure that the HF2 transmission operates.
10.On the Captain's side stick controller:
Push the radio PTT switch while you hold the First Officer's radio PTT switch pushed.	Make sure that there is no reception on the Captain's and First Officer's loudspeakers.
11.On the Captain's and First Officer's side stick controllers: Release the radio PTT switches.

5. Close-up
Subtask 23-11-00-860-053-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) On the Captain's and First Officer's ACPs:

Push the HF1 and HF2 transmission pushbutton switches.
Push the HF1 and HF2 reception pushbutton switches.

(2) On the RMP 1 and RMP 2:

Set the ON/OFF selector switches to OFF.

(3) On the Captain's and First Officer's jack panels:

Disconnect the boomsets.

(4) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:11:57 UTC