TM 55-2840-231-23
1-53. Rigid Tube Installation.
a. Tube assemblies must fit and align with the mating flare tube fittings to the degree that both ends of the assembly
flares shall uniformly seat in a free state on the cones of The mating fittings. The fit shall be without distortion or stretch-
ing of the tube assembly and to the degree that the nuts can be fully engaged up to the final one-half turn with light
finger pressure.
b. If proper alignment cannot be attained by repositioning mating flare tube fittings, bend the tube enough to pro-
vide alignment in the free-state as specified. Accomplish all bending with the tube removed from the engine. Adjust-
ment of the fit may be accomplished by bending by hand at principal bends. In the event the tube cannot be bent by
hand, use a proper tube bending device. The flattened effect of the cross section of the tube as a result of the reforming
operation must not exceed 15 percent of the tube OD.
c. When proper free-state alignment is attained complete the tubing installation by securing both the coupling nuts
and tightening them to proper torque. Always use a backup wrench on the tube fittings when tightening the tube cou-
pling nuts.
d. When a component to which rigid tube assemblies are attached is replaced, remove all interfering tube assem-
blies to permit easy removal and reinstallation of the component. This precaution will prevent later damage to the tube
assemblies.
1-54. Fuel Requirements. The fuel used for testing shall conform to item 43, Appendix D. The fuel supply system
shall be capable of supplying 250 pounds per hour (113.50 kg) flow over the range of 5 to 45 psig inlet pressure. A
sufficient number of 10 micron (No. 200 mesh screen) filter elements shall be provided to adequately filter the fuel
and allow the required flow rate.
1-55. Lubricating Oil Requirements. The engine lubricating oil used for testing shall conform to item 5, Appendix
D. The oil supply system shall be capable of maintaining oil inlet pressure within 0 to 1.8 psig and oil inlet temperature
within the range of 180° F to 225° F (82.2° C to 107.2° C). A sufficient number of 25 micron filters shall be provided
to adequately filter the scavenge oil.
1-56. Electrical Supply Requirements.
a. The ignition exciter requires a dc power supply of 28 volts (4 amps minimum).
b. The starter requires a source of external power capable of 350 to 400 amperes, and 28 volts is recommended
for starting the engine; however, limits of 300 to 750 amperes and 28 volts are allowable for starting the engine.
1-57. Drainage Requirements. When the engine is to be tested on the test stand, drain bottles shall be provided to
collect drainage from the burner drain valve, fuel pump seal drain, firewall shield drain and exhaust collector drain.
Combined drainage shall not exceed 2 cc/minute, except fuel pump seal drainage shall not exceed 0.5 cc/minute, of
this total.
1-58. Preservation Requirements. Engines which are not scheduled for immediate installation into the airframe shall
be preserved as outlined in paragraphs 1-35 thru 1-38.
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