JAR–E 440 Endurance Test
(a) The runs shall be made in the order and
in suitable non-stop stages agreed by the
Authority to be appropriate for the particular
Engine being tested.
(1) The whole of the Endurance Test
shall be run with the oil pressure set to give the
declared normal operating pressure at Maximum
Continuous conditions except that one hour at
Take-off conditions and nine hours at Maximum
Continuous conditions shall be run with the
pressure set to give the declared minimum for
completion of the flight at Maximum Continuous
conditions. The test conditions may be revised, if
necessary, to avoid having to stop the Engine
during particular stages in order to reset the oil
pressure.
(2) Where the operating conditions are
prescribed in terms of a percentage of Maximum
Continuous Power the crankshaft rotational speed,
manifold pressure and mixture strength shall be
appropriate to the simulation of critical (i.e. most
severe) cruising conditions at this power. Where
in such cases the manifold pressure is not greater
than that for Maximum Best Economy Cruising
Power, the mixture strength shall be compatible
with the manifold pressure.
(3) See ACJ E 440(a).
(b) Schedules
(1) Schedule for Unsupercharged
Engines and Engines Incorporating Gear-driven,
Single-speed Superchargers
Part 1 A 30-hour run consisting of alternate
5 minute periods at Take-off Power and
speed and Maximum Best Economy
Cruising Power or Maximum Recommended
Cruising Power conditions.
Part 2 A 20-hour run consisting of alternate
periods of 1½ hours at Maximum
Continuous Power and speed and ½ hour at
75% Maximum Continuous Power and 91%
Maximum Continuous speed.
Part 3 A 20-hour run consisting of alternate
periods of 1½ hours at Maximum
Continuous Power and speed and ½ hour at
70% Maximum Continuous Power and 89%
Maximum Continuous speed.
Part 4 A 20-hour run consisting of alternate
periods of 1½ hours at Maximum
Continuous Power and speed and ½ hour at
65% Maximum Continuous Power and 87%
Maximum Continuous speed.
Part 5 A 20-hour run consisting of alternate
periods of 1½ hours at Maximum
Continuous Power and speed and ½ hour at
60% Maximum Continuous Power and
84 . 5% Maximum Continuous speed.
Part 6 A 20-hour run consisting of alternate
periods of 1½ hours at Maximum
Continuous Power and speed and ½ hour at
50% Maximum Continuous Power and
79 . 5% Maximum Continuous speed.
Part 7 A 20-hour run consisting of alternate
2½ hour periods at Maximum Continuous
Power and speed and Maximum Best
Economy Cruising Power or Maximum
Recommended Cruising Power conditions.
(2) Schedule for Engine Incorporating
a Gear-driven Two-speed Supercharger
Part 1 A 30-hour run in the lower gear
ratio consisting of alternate 5 minute periods
at Take-off Power and speed and Maximum
Best Economy Cruising Power or Maximum
Recommended Cruising Power Conditions.
If a Take-off Power rating is desired in the
higher gear ratio, 15 hours of the 30-hour
run shall be made in the higher gear ratio in
alternate periods of 5 minutes at the power
obtainable with the Take-off critical altitude
manifold pressure and Take-off speed and 5
minutes at 70% high ratio Maximum
Continuous Power and 89% high ratio
Maximum Continuous speed.
Part 2 A 15-hour run in the lower gear ratio
consisting of alternate periods of one hour at
Maximum Continuous Power and speed and
½ hour at 75% Maximum Continuous Power
and 91% Maximum Continuous speed.
Part 3 A 15-hour run in the lower gear ratio
consisting of alternate periods of one hour at
Maximum Continuous Power and speed and
½ hour at 70% Maximum Continuous Power
and 89% Maximum Continuous speed.
Part 4 A 30-hour run in the higher gear ratio
at Maximum Continuous Power and speed.
Part 5 A 5-hour run consisting of alternate
periods of 5 minutes in each of the
supercharger gear ratios. The first 5 minutes
of each 10-minute period shall be made in
the higher gear ratio at Maximum
Continuous speed and the power obtainable
with 90% of Maximum Continuous manifold
pressure in the higher gear ratio under sea-level
conditions. The condition for operation
for the following 5-minute period in the
lower gear ratio shall be that obtained by
shifting to the lower gear ratio at constant
speed.
Part 6 A 10-hour run in the lower gear ratio
consisting of alternate periods of one hour at
Maximum Continuous Power and speed and
one hour at 65% Maximum Continuous
Power and 87% Maximum Continuous
speed.
Part 7 A 10-hour run in the lower gear ratio
consisting of alternate periods of one hour at
Maximum Continuous Power and speed and
one hour at 60% Maximum Continuous
Power and 84 . 5% Maximum Continuous
speed.
Part 8 A 10-hour run in the lower gear ratio
consisting of alternate periods of one hour at
Maximum Continuous Power and speed and
one hour at 50% Maximum Continuous
Power and 79 . 5% Maximum Continuous
speed.
Part 9 A 20-hour run in the lower gear ratio
consisting of alternate 2 hour periods at
Maximum Continuous Power and speed and
Maximum Best Economy Cruising Power
and speed or at Maximum Recommended
Cruising Power and speed.
Part 10 A 5-hour run in the lower gear ratio at
Maximum Best Economy Cruising Power
and speed or Maximum Recommended
Cruising Power and speed.
(3) Schedule for Engine Incorporating
a Turbo-supercharger. For Engines
incorporating a turbo-supercharger, the
Schedule of (1) will apply, except that –
(i) Entire run specified in Part 1
shall be made at sea-level pressure,
(ii) The portions of the runs
specified in Parts 2 to 7 at Maximum
Continuous Power shall be made at
critical altitude pressure and the portions
of the runs at other powers shall be made
at 2 500 m (8 000 ft) altitude pressure
(see ACJ E 440(b)(3)), and
(iii) The turbo-supercharger used
during the 150-hour Endurance Test shall
be run on the bench for an additional
50 hours at a representative inlet pressure
and at the limiting turbine wheel inlet gas
temperature and rotational speed for
Maximum Continuous Power operation
unless the limiting temperature and speed
are maintained during 50 hours of the
rated Maximum Continuous Power
operation.
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