CSP–520N–1
MD 520N (500N) ROTORCRAFT FLIGHT MANUAL
Limitations
R
Original
2–12
FAA Approved
2–12. V
NE
PLACARDS
Description:
The V
NE
placards provide the pilot with a method to determine the maxi*
mum indicated airspeed allowed for various gross weight, pressure altitude
and OAT combinations during powered or autorotative flight.
Use of Placards:
Select the appropriate card based on the takeoff gross weight of the aircraft
being flown. (Refer to example 1: 2450 lbs.
(1)
)
Determine the pressure altitude at which the aircraft is flying by adjusting
the altimeter setting to 29.92 (1013 millibars) and read the pressure alti*
tude from the altimeter. (Refer to example 1: 12,000 ft.
(2)
).
Note the Outside Air Temperature in degrees Celsius (
°
C) from the OAT
gauge in the aircraft. (Refer to example 1: −10
°
C
(3)
)
Read the V
NE
for powered flight from the block where the OAT and Pres*
sure Altitude columns cross. (Refer to example 1: 107 KIAS
(4)
)
Autorotation V
NE
(Refer to example 1
(5)
) is determined by subtracting 21
knots from the powered flight V
NE
until, in example 1, 90 knots is reached.
At this point the autorotation V
NE
stays at 90 knots until the powered
flight V
NE
goes below 90 knots at which point the autorotation and powered
flight V
NE’S
become the same.
Maximum V
NE
with less than 35 pounds of fuel (Refer to example 1
(6)
) is
129 knots IAS to insure that approximately 22.5 pounds of fuel remain us*
able.
V
NE
IAS (KNOTS)
°
C
–30
–20
–10
0
10
20
30
40
45
OAT
PRESS ALT X 1000
GROSS WT = 2351 TO 2500 LB
0
137
145
2
132
140
147
4
128
135
141
148
150
149
147
6
123
130
136
142
148
148
135
124
119
8
119
125
132
137
132
120
111
103
99
10
114
121
127
119
109
100
93
87
84
12
110
116
107
98
91
85
79
74
72
14
106
98
90
83
77
72
68
64
16
89
82
76
71
66
18
20
76
70
65
64
FOR AUTOROTATION V
NE
REDUCE SPEED BY 21 KTS
(90K MIN); DO NOT EXCEED CHART V
NE
MAX V
NE
129 KTS WITH LESS THAN 35 LB FUEL
(1)
(2)
(3)
(4)
(5)
(6)
EXAMPLE 1
NO FLIGHT
F05–057
