Description; Accelerometer; Stall Warning System - Cessna 150 Series Service Manual

Bug screen (7) should be inspected
and cleaned periodically.
1. Doorpost Cover
INSTALLATION
3. Scoop
5. Felt Seal
6. Adjustable Plate
7. Screen
6
5 Detail
A
Figure 15-6.
Stall Warning System
15-48. ACCELEROMETER.
15-50. STALL WARNING SYSTEM. (Refer to figure
15-6. )
15-49. DESCRIPTION. The Aerobatoffersan
accelerometer to assist pilot in performing precision 15-51. DESCRIPTION. The system is composed of
aerobatics. The accelerometer continuously indi- an adjustable plate on left wing leading edge, con-
cates g forces being imposed on aircraft.
The dial nected to a reed type horn by means of plastic tubing.
display utilizes three pointers; one pointer indicates
The horn is actuated approximately 5 to 10 miles per
instantaneous acceleration, another records maxi- hour above stalling speed as a negative air pressure
mum positive acceleration and the third records
area at wing leading edge causes a reverse flow of
maximum negative acceleration. Maximum instru-
air through horn. By moving adjustable plate (6) up,
ment markings range from 10G to 5G. A "PUSH TO actuation of horn will occur at a higher speed and
SET" knob, located on lower left corner of instru- moving plate down causes actuation to occur at a
ment, is used to reset "Maximum Positive" and
slower speed. Center adjustable plate opening in
"Maximum Negative" pointers.
If dual Nav/Coms wing leading edge upon inst allation, then ight test
are installed, the accelerometer is installed i
n a aircraft, observing horn actuation during stall. Re-
housing above instru
ment panel on pilot's side. When adjust plate to obtain desired results if necessary.
aircraft is equipped with single Nav/Com , accelero-
Approximately 3/32 inch adjustment of plate will
meter is installed in the vacant Omni instru-
change speed at which horn actuation occurs by 5
mensnt space miles per hour . To test horn operation cove r
opening in plate (6) with a clean cloth, such as a
handkerchief and apply a slight suction by mouth to
draw air through horn.
15-17