settings are not as specified, check and adjust as follows
(a) Connect gas turbine engine analyzer to power unit as described in paragraph 4-14b. Control engine speed
with valve on analyzer panel (fig. 4-14).
(b) Use tach-generator rpm gauge on analyzer panel to read engine speed.
(c) Start and operate engine as described in paragraph 4-14d checking for switch actuation of centrifugal
(d) If 35 percent switch requires adjustment, remove cover plate from centrifugal multispeed switch and adjust
position of top screw (screw farthest from switch receptacle). Replace cover plate and recheck switch setting at least
If 35 percent switch setting is changed, the settings of the 95 percent speed switch and the overspeed (110
percent) switch must be checked
(e) If the 95 percent speed switch requires adjustment, remove cover plate from centrifugal multi-speed switch
and adjust position of middle screw. Replace cover plate and recheck switch setting at least twice.
(f) To check actuation of overspeed (110 percent) switch, use screwdriver and wrench assembly (special
tools); loosen locknut and turn fuel control assembly governor adjusting screw two full turns clockwise to increase
governor setting. Start engine and use needle valve (fig. 4-14) on analyzer panel to slowly accelerate to overspeed
condition. Overspeed (110 percent) switch should actuate to shut down engine at 4512 + 25 tach-generator rpm reading
(equal to an engine speed of 44,250 + 250 rpm).
(g) If overspeed (110 percent) switch requires adjustment, remove cover plate and adjust position of bottom
screw (screw nearest to receptacle). Replace cover plate and recheck switch setting at least twice.
(h) When all switch settings are satisfactory, reset fuel control assembly governor screw to original position.
(i) Recheck fuel control assembly governor setting as described in paragraph 4-14e (4).
(j) When centrifugal multi-speed switch checks and fuel control assembly governor setting checks are
satisfactory, disconnect and remove gas turbine engine analyzer.
Section VII. Radio Interference Suppression
4-15. General Methods Used to Attain Suppression
Essentially, suppression is attained by providing a low resistance path to ground for the stray currents. The
methods used include shielding the ignition and high frequency wires, grounding the frame with bonding straps, and using
capacitors and resistors.
4-16. Interference Suppression Components
Primary Suppression Components. The primary suppression components are those whose primary function is to
suppress radio interference. These components are illustrated in fig. 4-17.
Secondary Suppression Components. These components have radio interference suppression functions which
are incidental or secondary to their primary function.
4-17. Replacement of Suppression Components
Refer to fig. 4-17 and replace the radio interference suppression components
4-18. Testing of Radio Interference Suppression Components
Test the capacitors for leaks and shorts on a capacitor tester; replace defective capacitors. If test equipment is
not available and interference is indicated, isolate the cause of interference by the trialand-error method of replacing
each capacitor in turn until the cause of interference is located and eliminated.
Section VIII. Maintenance of Power Plant Assembly Installation and Stowed Components
This section details the maintenance of the power plant assembly authorized for organizational level. The power
plant assembly consists of all stowable items such as external fuel filters, air conditioning ducts, hoses, electrical cables
and inflation ejector which connect the power plant to the inflatable shelter.
4-20. Dual Water Hose Assembly.
General. The dual water hose assembly (fig. 1-15, sheet 3 of 7) connects the hot and cold water