SECTION 9
SUPPLEMENT 1
SECTION 5 • PERFORMANCE
PA-28-181, ARCHER Ill
Operation of the air conditioner will cause slight decreases in cruise speed •
and range. Power from the engine is required to run the compressor, and the
condenser door, when extended, causes a slight increase in drag. When the air
conditioner is turned off there is normally no measurable difference in climb,
cruise or range performance of the airplane.
NOTE
To ensure maximum climb performance the air
conditioner must be turned off manually before
takeoff to disengage the compressor and retract the
condenser door. Also the air conditioner must be
turned off manually before the landing approach in
preparation for a possible go-around.
Although the cruise speed and range are only slightly affected by the air
conditioner operation, these changes should be considered in preflight planning.
To be conservative, the following figures assume that the compressor is
operating continuously while the airplane is airborne. This will be the case only •
in extremely hot weather.
(a) The decrease in true airspeed is approximately 4 KTS at all power
settings.
(b) The decrease in range may be as much as 32 nautical miles for the 48
gallon capacity.
The climb performance is not compromised measurably with lhe air
conditioner operating since the compressor is declutched and the condenser
door is retracted, both automatically, when a full throttle position is selected.
When the full throttle position is not used or in the event of a malfunction
which would cause the compressor to operate and the condenser door to be
extended, a decrease in rate of climb of as much as 100 fpm can be expected.
Should a malfunction occur which prevents condenser door retraction when the
compressor is turned off, a decrease in rate of climb of as much as 50 fpm can
be expected.
SECTION 6 • WEIGHT AND BALANCE
Factory installed optional equipment is included in the certified weight and
balance data in Section 6 of U1e Pilot's Operating Handbook.
REPORT: VB-2749
ISSUED: December 22, 2017
9-6, 4 of6
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