B4 Limitations

Question 1

Types of Ops Approved

Answer 1

Day VFR

Question 2

Forbidden Operations

Answer 2

• Aerobatics
• Engine starting in snow or ice around intake
• Flight in falling snow without sand filter
• Flight in freezing rain or icing (or conducive for)
• In flight use of twist grip except for engine failure training, emergency procedures, or mx checks
• In flight intentional turn off of VEMD

Question 3

Red Line meaning

Answer 3

Safety limit or takeoff limit

Question 4

Red/white hatching meaning

Answer 4

Vne, power off

Question 5

Yellow range meaning

Answer 5

Caution range or takeoff rating range

Question 6

Green range meaning

Answer 6

normal operations range

Question 7

White triangle meaning

Answer 7

equip operating limit

Question 8

Red triangle meaning

Answer 8

transient limit

Question 9

Min Weight
Max Weight

Answer 9

3307 lbs
5350 lbs

Question 10

Vne power off

Answer 10

125 kts - 3kts/1000ft

Question 11

Vne power on

Answer 11

155 kts - 3kts/1000ft

Question 12

Vne with doors open or removed

Answer 12

Depends on the configuration - reference RFM

Lowest Value - 70 kts

Question 13

Max operating altitude

Answer 13

We have Post MOD 07-3587:
20,000 Hp

Question 14

Min/Max operation temp

Answer 14

-40C
IAS +35C limited to +50C

Question 15

Slope landing limits

Answer 15

Nose up - 6 deg
Nose down - 6 deg
Sideways - 8 deg

Question 16

Manuevering Limits

Answer 16

Do not exceed the load factor causing (LIMIT) yellow caution light to come on

Question 17

Rotor brake limits

Answer 17

1. prohibited to start with rotor brake engaged
2. 5min time required between 2 consecutive applications
3. 170 RPM max application speed

Question 18

MR Limits

Answer 18

170 RPM : Max rotor brake speed
320 RPM : min power off
320 - 375 RPM : Caution Range
375 - 405 RPM : Norm op range
405 - 430 RPM : Caution range
430 RPM : max power off

Question 19

Horn speeds

Answer 19

Low Nr </= 360 RPM
High Nr >/= 410 RPM

Question 20

FLI

Answer 20

9.6 mcp
9.6 - 10 takeoff power
10 max takeoff
10.4 max transient (5 sec)

Question 21

TQ Limits

Answer 21

92.7 % mcp
92.7 - 100 % from 0-40kts
100 % max takeoff
104 % max transient (5sec)

Question 22

Nf (free turbine speed) Limits

Answer 22

349 RPM min
349 - 418 RPM normal
418 RPM mcp
450 RPM max transient (5 sec)

Question 23

Ng Limits

Answer 23

Ng = 67 % min stabilized speed

-4% mcp
-4 to 0% takeoff power
0% max takeoff rating
+1% max transient (5 sec)

Question 24

t4 Limits - Starting

Answer 24

750C max continuous
865C max transient (10 sec)

Question 25

t4 Limits - Flight

Answer 25

849C max continuous
849 - 915C takeoff power
915C max takeoff
941C max transient (20 sec)

Question 26

Oil Temp Limits

Answer 26

-10C to 0C Caution range
115C max temp

min oil temp before power is 0C

Question 27

Oil Press Limits

Answer 27

1.1bar min pressure
1.1 - 2bar caution range
6 - 9.8bar caution range
9.8bar max pressure

Question 28

Electrical circuit limits

Answer 28

Max V - 31.5V (rated 26-29V)
Max Current - 200A starter gen

Question 29

RH/LH cargo limit

Answer 29

62.5 lb/ft^2 = max distrib. load

RH - 287lb
LH - 342lb

Question 30

Rear cargo limit

Answer 30

30 lb/ft^2 = max distrib. load

Rear cargo - 176 lb

Question 31

Purpose of the limits set on N1/T4/Torque

Answer 31

N1 and T4 limits are to protect the engine
Torque limits are to protect the MGB