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transmission. A speed increase from 100% reference to
104% is possible. Refer to figure 5-1 for limitations.
a. Rotor Start and Stop Limits. Maximum wind
velocity for rotor start or stop is 45 knots.
b. Rotor Speed Limitations. Refer to figure 5-1
for rotor limitations.
5-2 Change 3
TM 1-1520-238-10
Figure 5-1. Instrument Markings (Sheet 1 of 6)
Change 3 5-3
TM 1-1520-238-10
Figure 5-1. Instrument Markings (Sheet 2 of 6)
5-4
TM 1-1520-238-10
Figure 5-1. Instrument Markings (Sheet 3 of 6)
5-5
TM 1-1520-238-10
Figure 5-1. Instrument Markings (Sheet 4 of 6)
5-6
TM 1-1520-238-10
Figure 5-1. Instrument Markings (Sheet 5 of 6)
5-7
TM 1-1520-238-10
Figure 5-1. Instrument Markings (Sheet 6 of 6)
5-8
TM 1-1520-238-10
5.6 ENGINE POWER LIMITATIONS.
The absolute limitations, regardless of atmospheric
conditions, are shown in figure 5-1. For variation in
power available with temperature and pressure altitude,
refer to the charts in Chapter 7 or Chapter 7A
NOTE
The Np and Nr, triple tachometer for the
-701 and -701C engines have different
markings. However, both engines
should be operated within the same normal
operation limit of 104% Np and a maximum
Nr limit of 110%.
5.7 ENGINE START LIMITS.
Refer to figure 5-1 for limitations.
5.8 ENGINE STARTER LIMITATIONS.
The pneumatic starter is capable of making the number
of consecutive start cycles listed below, when exposed to
the environmental conditions specified, with an interval
of at least 60 seconds between the completion of one
cycle and the beginning of the next cycle. A starting
cycle is the interval from start initiation and acceleration
of the output drive shaft, from zero rpm, to starter
dropout. The 60-second delay between start attempts
applies when the first attempt is aborted for any reason
and it applies regardless of the duration of the first attempt.
If motoring is required for an emergency, the
60-second delay does not apply.
a. At ambient temperatures of 16 °C (61 °F) and below,
two consecutive start cycles may be made, followed
by a 3-minute rest period, followed by two additional
consecutive start cycles. A 30-minute rest period is then
required before any additional starts.
b. At temperatures above 16 °C (61 °F), two consecutive
start cycles may be made. A 30-minute rest period
is then required before any additional start cycles.
c. Dual engine starts are prohibited.
5.9 ENGINE TEMPERATURE LIMITATIONS.
Refer to figure 5-1 for limitations.
Section III. POWER LIMITS
5.10 PNEUMATIC SOURCE INLET LIMITS.
The minimum ground air source (pneumatic) required
to start the helicopter engines is 40 psig and 30 ppm.
The maximum ground-air source to be applied to the
helicopter is 50 psig.
5.11 ENGINE OVERSPEED CHECK LIMITATIONS.
Engine overspeed check in flight is prohibited. Only
maintenance test flight pilots are authorized to perform
an overspeed check.
5.12 APU OPERATIONAL LIMITS.
Avoid prolonged operation at 94% -
96% NR with the APU running. The
APU clutch will oscillate from engaged
to disengaged. This creates
high loads on the clutch and shall be
avoided.
a. APU operation is prohibited during normal
flight. After a fault or aborted start, wait 30 seconds after
compressor has stopped before attempting another
start. After two consecutive start attempts, wait 20
minutes before third start attempt. No more than three
start attempts are permitted in one hour.
Do not operate the APU for more
than five minutes at a main transmission
oil temperature of 120 degrees C
(248 degrees F). Shut down APU to
prevent damaging accessory gearbox
components.
b. During prolonged ground operations greater
than 30 minutes the on-command test 19 TRAN shall
be periodically executed and the XMSN 1 and XMSN 2
temperatures observed. If the temperature exceeds 130
°C (266 °F), the APU shall be secured and the transmission
fluid allowed to cool for 30 minutes prior to resuming
APU ground operations; or transmission fluid may
be cooled by operating an engine with rotor turning.
There is NO requirement to remove transmission side
panels during extended APU ground operations. However,
the transmission fluid will not get as hot under
high ambient temperature conditions if the side panels
are removed.
Change 4 5-9
TM 1-1520-238-10
Section IV. LOADING LIMITS
5.13 CENTER OF GRAVITY LIMITS. 5.14 WEIGHT LIMITATIONS.
The maximum gross weight of the helicopter is 21,000
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