First article endurance test cycle - Continued.
NATO endurance test results.
During the NATO standard engine test
AC/225 (panel II) D 131 (part II), the engine performance and other characteristics (parameters)
shall be measured/calculated and monitored as follows:
Pre- and post-test performance.
Before and after the test, and at the end of each
100 hour period, a full power setting corrected performance test curve
(see figure 1 for a sample) shall be plotted from measurements taken at a
minimum of seven speed settings in descending order, the first setting being at the
The speeds to be run include 1200, 1400, 1600, 1800, 2000, 2200
and 2400 rpm.
The quantity of oil in the engine shall be checked with the
engine dipstick at the idle period of each 5-hour cycle and oil shall be added to
reach full mark on dipstick.
Quantity of oil added shall be recorded.
specific oil consumption shall be calculated every 50 hours based on oil used and
average horsepower hours run.
At the conclusion of each 100-hour test period, the engine cooling
fans shall be removed and fuel injection lines, nozzles, pumps, etc. shall be
visually inspected for defects and fuel and oil leaks, and the results recorded.
Engine output checks. At the conclusion of each 100 hour test period, the engine
shall be operated at 2400 rpm full power setting.
The fuel flow shall be checked
and adjusted within 2 pounds per hour (lb/hr) (0.907 kg/hr) of that observed for
the pre-test performance test specified in 126.96.36.199.2.1.a.
The details of any
adjustments made shall be recorded.
Then the engine output shall be calculated
The following engine parameters shall be monitored at the
end of period numbers 2, 4, 5, and 6 of the test except as noted:
Engine speed, rpm.
Engine load, torque, lb-ft.
Intake manifold pressure, in. of Hg.