perature, gross weight, and other parameters relating to that
7-23
Cruise -Pressure Altitude
phase of .ight are presented. In addition to the presented
16,000 Feet .............................. 7-105
data, your judgment and experience will be necessary to 7-24 Cruise High Drag -Pressure accurately obtain performance under a given set of circum-Altitude 16,000 Feet................ 7-110 stances. The conditions for the data are listed under the title of each chart. The effects of different conditions are dis-
7-25
Cruise -Pressure Altitude
cussed in the text accompanying each phase of perfor-
18,000 Feet .............................. 7-114
mance. Where practical, data are presented at conservative
7-26
Cruise High Drag -Pressure
conditions. However, NO GENERAL CONSERVATISM
Altitude 18,000 Feet................ 7-119
HAS BEEN APPLIED. All performance data presented are 7-27 Cruise -Pressure Altitude within the applicable limits of the helicopter. All .ight per-20,000 Feet .............................. 7-123 formance data are based on JP-4 fuel. The change in fuel .ow and torque available, when using JP-5 or JP-8 aviation
7-28
Cruise High Drag -Pressure
fuel, or any other approved fuels, is insigni.cant.
Altitude 20,000 Feet................ 7-127
V OPTIMUM CRUISE ............... 7-131
7.4 LIMITS.
7-29 Optimum Altitude for Maximum Range ..................... 7-132 VI DRAG ...................................... 7-134 7-30 External Load Drag ................. 7-135 VII CLIMB -DESCENT............... 7-137 Exceeding operating limits can cause per-manent damage to critical components.
7-31
Climb/Descent.......................... 7-138
Overlimit operation can decrease perfor-
7-32
Climb/Descent -
mance, cause early failure, or failure on a
High Drag ................................ 7-139
subsequent .ight.
7-2 Change 2
Applicable limits are shown on the charts. Performance generally deteriorates rapidly beyond limits. If limits are exceeded, minimize the amount and time. Enter the maxi-mum value and time above limits on DA Form 2408-13-1, so proper maintenance action can be taken.
7.5 USE OF CHARTS.
7.5.1 Dashed Line Data. Weights above 22,000 pounds are limited to ferry missions for which an Airworthiness Release is required. On some charts dashed line data are shown for gross weights greater than 22,000 pounds.
7.5.2 Data Basis. The type of data used is indicated at the bottom of each performance chart under DATA BASIS. The data provided generally is based on one of three cat-egories:
a.
Flight test data. Data obtained by .ight test of the helicopter by experienced .ight test personnel at precise conditions using sensitive calibrated instruments.
b.
Calculated data. Data based on tests, but not on .ight test of the complete helicopter.
c.
Estimated data. Data based on estimates using aero-dynamic theory or other means but not veri.ed by .ight test.
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