Limits Flashcards
Minimum Nf (4.3.1 / 4-1)
97%
Maximum continuous Nf (4.3.3 / 4-1)
100%
Avoid Range (Steady-State Operation) (4.3.3 / 4-1)
71-88% Nf with engine torque great than 33%
- Steady state is defined as holding Nf within a 2% range
- Holding Nf in this range for 60 cumulative seconds requires turbine replacement and shall be voided
- Flight in this range shall be recorded on a MAF to ensure documentation and shall include duration
Idle Ng rpm (4.3.3 / 4-1)
62 +/- 2 %
Ng normal operating range (4.3.3 / 4-1)
60 - 105%
Ng maximum transient (4.3.2 / 4-1)
106% is allowed for 15 seconds
Minimum engine oil pressure (4.3.3 / 4-1)
50 psi with Ng below 79%
90 psi with Ng between 79-94%
115 psi with Ng above 94%
Maximum engine oil pressure (4.3.3 / 4-1)
130 psi, except for temporary conditions up to 150 psi maximum immediately following a cold-weather start
Engine oil temperature limits (4.3.4 / 4-1)
0* - 107*C
Maximum head wind (4-3)
Up to 40 Knots
Maximum cross wind (left or right) (4-3)
Up to 25 Knots
Maximum tail wind (4-3)
Up to 17 Knots
Engine oil temperature gauge colors (4-4)
Green: 0-107
Red: 107*
Engine oil pressure gauge colors (4-4)
Red: 50 psi Yellow: 50-90 psi Green: 90-115 psi (Single-Wide Arc) Green: 115-130 psi (Double-Wide Arc) Red: 130 psi
Transmission oil pressure gauge colors (4-4)
Red: 30 psi
Green: 30-50 psi
Red: 70 psi
Transmission oil temperature gauge colors (4-4)
Green: 15-110C
Red: 110*C
Loadmeter gauge color (4-4)
Red: 70%
Fuel pressure gauge color (4-4)
Red: 4.0 psi
Green 4.0-30.0 psi
Airspeed gauge color (4-4)
Green: 0-130 knots
Red: 130 knots
Blue: 100 knots
Torque gauge color (4-5)
Green: 0-85.0%
Yellow: 85.0-100%
Red: 100%
TOT Gauge color (4-5)
Green: 100*-738* Yellow: 738*-810* Red: 810* Red circle: 843*C Red triangle: 927*
Fuel quantity gauge colors (4-4)
Red: 1.03 Gallons/Empty
Ng gauge colors (4-6)
Green: 60.0 to 105.0%
Red: 105.0%
Nf indicator gauge color (4-6)
Red: 97%
Green: 97-100%
Red: 100%
Nr indicator gauge color (4-6)
Yellow: 50.0-60.0%
Red: 90%
Green: 90-107%
Red: 107%
Turbine Outlet Temperature (During Start)
Temperature Range|Time Limit (4.3.5 / 4-7)
up to 810* | No Limit
810* - 927| 10 seconds max
927 | Max
Turbine Outlet Temperature (During Transient)
Temperature Range|Time Limit (4.3.5 / 4-7)
Up to 738* | No limit
738* - 810* | 5 Min.
810* - 843* | 6 Sec.
843* Max
Minimum fuel reserve requirement for TH-57B/C (4.3 / 4-7)
10 Gallons
Nr Limits (Power-on) (4.4 / 4-7)
Minimum: 97%
Maximum: 100%
Nr Limits (Power-off) (4.4 / 4-7)
Normal Operating range is 90 - 107%
Transmission Oil Pressure limits for continuous operations (4.5 / 4-7)
30 - 50 psi
Minimum Transmission Oil Pressure (4.5 / 4-7)
30 psi
Maximum Transmission Oil Pressure (4.5 / 4-7)
70 psi
Transmission Oil Pressure that dictate a MAF (4.5 / 4-7)
50 - 70 psi
Transmission Oil Temperature limits (4.5 / 4-7)
15* - 110*C
Max continuous torque (4.6 / 4-7)
85%
Military torque power limit (4.6 / 4-7)
100% for 5 minutes
Transient torque limit (4.6 / 4-7)
100 - 110% for 5 seconds
Allowable fuel boost pump pressure (4.7 / 4-8)
4 - 30 psi
Standby generator limits (C) (4.8 / 4-8)
Prolonged operation of the standby generator while it is the primary power supply to the essential No. 1 bus is prohibited at speeds below 65 KIAS
Rotor brake limit(4.9 / 4-8)
Should be applied between 38 - 30% Nr during normal operations
Starter limits Note
If a light-off occurs within the first 20 seconds of the start sequence, the starter may be operated for 60 seconds within a 60 second cooling period. Three such attempts can be made in a 30-minute period, then wait 30 minutes to allow the starter to cool.
Starter limitations (External power) (4.10 / 4-8)
25 Seconds - ON 30 Seconds - OFF 25 Seconds - ON 30 Seconds - OFF 25 Seconds - ON 30 Minutes - OFF
Starter limitations (Battery) (4.10 / 4-8)
40 Seconds - ON 60 Seconds - OFF 40 Seconds - ON 60 Seconds - OFF 40 Seconds - ON 30 Minutes - OFF
Vne FCS OFF (4.10 / 4-8)
130 KIAS
Vne FCS ON (4.10 / 4-8)
122 KIAS
Sideward/rearward flight (4.11 / 4-8)
Density Altitude Feet/ Max Sideward/ Max Rearward 0-1,000 ft/ 25/ 15 1,000-2,000 ft/ 20/ 15 2,000-4,000 ft/ 15/ 15 4,000-6,000 ft/ 10/ 10 6,000-10,000 ft/ 5/ 5
Max Rate of Climb (4.11 / 4-9)
50 KIAS
Min IFR Speed (4.11 / 4-9)
65 KIAS
Max airspeed with any combination of doors off (4.11 / 4-9)
110 KIAS
Max autorotional speed (4.11 / 4-9)
100 KIAS
Turbulence penetration airspeed (4.11 / 4-9)
80 KIAS
Max Operating altitude: FCS OFF: 3,000 lbs gross wight and below (4.12 / 4-9)
20,000 foot pressure altitude
18,000 foot DA
Maximum operating altitude:
FCS OFF: Above 3,000-pound gross weight (4.12 / 4-9)
16,000 ft pressure altitude
13,000 ft density altitude
Maximum operating altitude:
IFR or FCS ON: 3,000-pound gross weight and below (4.12 / 4-9)
11,500-foot pressure altitude
13,500-foot density altitude
Maximum operating altitude:
IFR or FCS ON: Above 3,000-pound gross weight (4.12 / 4-9)
8,500-foot pressure altitude
11,000-foot density altitude
Climb/Descent Limits in IMC (4.13 / 4-9)
1,000 ft/min
Acceleration limits (G’s) (4.14 / 4-9)
Upper: +2.5 g’s
Lower: +0.5 g’s
at max gross weight
Max gross weight internally (4.15 / 4-9)
3,200 lbs
Max gross weight including external cargo (4.15 / 4-9)
3,350 lbs