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This page is an archived version of the page that described the Brooklyn Tool and Machine Company's Flight Test Division. The Brooklyn Tool and Machine Company has closed shop and these facilities are no longer available. For information regarding the Model 916 Stick Force Indicator please contact btmtrading@cs.com.
FACTS
FAIRCHILD AIRCRAFT CORPORATION
TIPS AND SERVICE
JANUARY 1987
STICK FORCE INDICATOR
In order to accurately perform the stick force check for SAS, the FAC factory uses an indicator that is used by the FAA as a flight test standard.
Instrument Assembly:
Each unit includes a hand grip, force transmitting arm, cantilever
spring, lever arm, dial indicator and mounting base for
temporary attachment to the control stick, wheel, or throttle. The
indicator pointer rotates 360 degrees for the full range specified. An
additional feature is a maximum pointer, which remains at the highest
pressure reading until reset manually. Each 0.001 inch input into the
indicator corresponds approximately to one pound of force applied to
the grip. A stop screw limits the deflection of the cantilever spring.
Calibration Test:
Each instrument is calibrated for its full range for both increasing
and decreasing loads. The average spread in the corrections obtained
at 9 or more equally spaced test points In the range to full load will
not exceed 2% of the maximum scare reading. The Indication, increasing
or decreasing, will at no point differ more than 2% of maximum scale
readings from the true load, except at zero load where the indication
will be within plus or minus one half percent of the maximum scale
reading. The Instrument is calibrated in a horizontal position by
suspending weights In a hanger arrangement hung over the center of the
grip and reading the Instrument after tapping the mounting: account is
taker of any shift in indication due to change from the normal
vertical. A calibration chart is furnished with each instrument.
Flight Test
STICK FORCE INDICATOR
GRIP TYPE - MODEL 916
A hand-held force indicator that registers the amount of pressure
needed to move an aircraft's stick, wheel or throttle, in flight or on
the ground. It replaces cumbersome strain gages.
Used as a flight test standard by the Federal Aviation Agency and
carries U. S. Army Aviation Part Number 6625NL133.
Intended for airplanes, helicopters or flight simulator controls, the
instrument is available in four ranges, 0-30 lbs.. 0-5Olbs., 0-100
lbs., 0-200 lbs, designed to remain accurate within +/- 2%.
All units have a direct-reading dial with a maximum pointer which
remains at the highest pressure reading until reset manually. A
calibration chart is furnished with each instrument.
All steel parts are nickel plated and rustproof: aluminum parts are anodized.
The instrument is available in four ranges:
Model No. Range (lbs.)
916D 0- 30
916A 0- 50
916B 0-100
916C 0-200
Instrument Assembly:
Each unit includes a hand grip, force transmitting arm, cantilever
spring, lever arm, Federal dial indicator and mounting base for
temporary attachment to the control stick, wheel or throttle. The
indicator pointer rotates 3600 for the full range specified. A maximum
pointer remains at the highest pressure reading until reset
manually. Each 0.001 input into the indicator corresponds
approximately to one pound of force applied to the grip. A stop screw
limits the deflection of the cantilever spring.
Calibration Test:
Each instrument is calibrated for its full range for both increasing
and decreasing loads. The average spread in the corrections obtained
at 9 or more equally spaced test points in the range to full load will
not exceed 2% of the maximum scale reading. The indication, increasing
or decreasing, will at no point differ more than 20% of maximum scale
readings from the true load, except at zero load where the indication
will be within plus or minus one half percent of the maximum scale
reading. The instrument is calibrated in a horizontal position by
suspending weights in a hanger arrangement hung over the center of the
grip and reading the instrument after tapping the mounting: account is
taken of any shift in indication due to change from the normal
vertical. A calibration chart is furnished with each instrument.
Finish: All steel parts are nickel plated and rustproof; aluminum
parts are anodized.
Weight: 1.5 pounds
Meets National Bureau of Standards Specifications.
Contact us by E-Mail at btmtrading@cs.com.
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