Beechcraft Baron G58 Pilot Operating Handbook page 577

Airplane Flight Manual Supplement
Beechcraft Baron Models
G58, 58A, 58, E55A, E55, D55A, AND D55
SECTION 7 –SYSTEMS DESCRIPTION (continued)
The Heating System performs the following functions:
1. Warms cabin air temperature.
2. Helps prevent fogging of windows.
3. Provides for defog air.
Control of the heating system temperature cycle is done by controlling the mechanical thermostat which
regulates the operation of the combustion heater located in the nose of the aircraft. The thermostat senses
the heater duct temperature and cycles the combustion heater to regulate that temperature.
combustion heater operation and cool down, the heater/fresh air valve in the nose of the aircraft is
automatically opened by the climate control system. The valve is closed during other modes of operation.
When the heater mode is shut down either by the automatic climate control system (automatically or
manually changing to the cooling mode), the pilot during aircraft operation or due to the shut down of the
aircraft after a flight, a heater timer module and a heater control module will operate the heater/fresh air
blower automatically for approximately 2 minutes to cool the combustion heater. This 2 minute cool down
function operates even with the aircraft battery and alternator master switches turned off. The 2 minute cool
down function can be interrupted by turning the Master Heater Fan Switch to the "OFF" position. The
Master Heater Fan Switch is located on the left-hand sub-panel as shown in Figure 2, below. The Master
Heater Fan Switch should normally remain in the "ON" position at all times even when the aircraft is shut
down and the Master Battery and Alternator Switches are turned off. Note that during flight operations when
the landing gear is retracted, heater operation and heater cooling is provided by ram air instead of the
heater/fresh air blower. This applies to the heater 2 minute cool down period if that is required during flight:
the automatic heater/fresh air valve remains open for 2 minutes to cool the combustion heater using ram air.
All outside air vents must be closed for maximum heating.
FAA Approved 04/23/2012
Figure 2
MASTER HEATER FAN SWITCH
NOTE
Document No. FTA-010-6
Revision IR
Page 9
During
MASTER
HEATER FAN
MASTER
HEATER
FAN