Cessna SKYMASTER 337 Series User Manual

Cessna illustrated parts catalog
SIDETONE ADJUSTMENT EXTENDER CABLE
AUDIO SIDETONE ADJUSTMENT PROCEDURES
1. Speaker sidetone can only be adjusted by the Sidetone Potentiometer (Item 2) mounted inside
the Audio Control Panel Assy (Item 1).
2. A test extender
Test Harness Assy (Item 3) is
available through the Cessna Service Parts
Center to facilitate the service technician in making in-flight or on-the-ground sidetone
adjustments.
3. The Sidetone Potentiometer (Item
2) should have been adjusted at the factory
to the maximum
clockwise
position (Minimum Resistance Value)
upon assembly as viewed from the
back of the
Audio Control Panel (Item 1).
4.
During adjustment, be aware that if the
sidetone level is set too high, it can
cause audio
feedback (squeal) when transmitting.
5. If reduced sidetone
is desirable, rotate the Potentiometer
(Item 2) counterclockwise to
obtain the desired listening level.
6. Speaker sidetone
is available on 1979 300 & 400 Nav/Coms
(Types RT-385A & RT-485A) when
the "AUTO"
switch is set in the "SPEAKER" position.
Adjusting the pot as previously outlined
will assure the desired audio setting for speaker sidetone.
1
INSERTS INTO AUDIO CONTROL
PANEL DUST COVER
4-8
1. 1979
Typical Audio
Control Panels
(0570442-1,0570442-2,0597001-
and 0597001-2)
(See Figure
4-1
2. BH66490
Potentiometer
-
Sidetone Adjustment
3. 9870003-1 Test Harness Assembly
Extender Cable
337
SERIAL 3371875
THRU 33701921
T337
SERIAL 3371875
THRU 33701921
P337
SERIAL P3370319
THRU P3370341
Figure 4-2. 1979
Audio Control Box Test
Extender Cable Assembly
(9870003-1) - Used for
Audio Sidetone Adjustment

Cessna SKYMASTER 337 Series Specifications

General

Manufacturer	Cessna
Crew	1
Capacity	5 passengers
Length	9.07 m (29 ft 9 in)
Wingspan	11.63 m (38 ft 2 in)
Height	2.84 m (9 ft 4 in)
Power Output	210 hp (157 kW) each
Maximum Speed	322 km/h (200 mph, 174 kn)
Powerplant	2 × Continental IO-360-C
Service Ceiling	5, 791 m (19, 000 ft)