TH-57 Limitations
 
AIRFRAME 
Dimensions 
Main rotor 33’4” 
Tail rotor 5’5” 

Weights 
Max Gross Weight 3200lbs 
Max Gross + Ext. Load 3350lbs 
Max Cargo Hook 1500 lbs. 
Tail Skid Upward  400 lbs. 
Tail Skid downward 200 lbs. 
Min Crew weight 180 

Main Rotor 
94 lbs. 
13” chord length 
2 ¼ degrees preconing 
5 degrees blade twist 

Tail Rotor 
2554 rpm (2.35:1) 
System Oil 3/8th pt 

CG 
AFCS Off 106.0 - 114.2  
AFCS On 106.75 - 112.5 

Required Equipment -IMC  
Cyclic Force trim 
Ministab FCS (pitch/ roll) 
Main generator 
Stby generator 
Battery protection circuit {Bat relay} 
Instantaneous VSI 
Two att indicators (one powered by stby bat) 
One operable comm system 
One operable nav system 
 Radar altimeter 
Other Equip - {OPNAV} 
 Airspeed Indicator 
 Tun needle + slip indicator {ball} 
 Magnetic compass 
 Heading indicator 
Clock w/ min, sec, sweep  hand 
 Icing control equip  
 Navigation lights 

Required  Equipment -Night  
All instrument and C/B panel lights 
All exterior lights 
Operable comm radio 
Attitude gyro 
Radar altimeter 

Maneuver Limits  
Max Climb Rate 1000 fpm 

Prohibited Maneuvers  
No aerobatic maneuvers 
AOB greater than 60 
Protracted ops in Caution/ Avoid  
              -Height-Velocit  area 
Intentional entry  
            -blade stall/ power settling 
Hovering turns > 45o /sec 

ENGINE 
6 stage axial, 1 stage centrifugal 
6.5 times ambient press 
Diffuser Scroll 500F  
420 SHP / 317 SHP 

Drive Trains 
Ng 
51,989 RPM 
Accelerate through 50-60% 
Flight idle 62% +3% 
Normal 60-105% 
Max transient (15 sec) 106% 
Eng Out  55 + 3% 

Nf 
33,956 RPM 
Output shaft 6000 RPM 
Normal 97-100% 
Beep Control 96-101% + .5% 
Max transient (chart) 

Nr  
Accelerate Through 50-60% 
Normal 90-107% 
Transient (5 sec) 107-114% 
Low Rotor RPM  90 + 3% 

Eng Oil System (5.5 qt. tank) 
Engine Oil Temp  
   Min  0 C 
   Max 107 C 
Engine Oil Pressure  
   Min 50 psi 
   Ng < 79% Min 50 psi 
   Ng 79-94% Min 90 psi 
   Ng >94% Min 115 psi 
   Max normal 130 psi 
   Max cold wx start 150 psi 

TOT   
Normal 100-738 C 
Military ( 5 min) 738-810 C 
Transient (6 sec) 810-843 C 
Normal start - 810 C 
Transient (10 sec) 810-927 C 
Torque 
Normal 0-85% 
Military (5 min) 85-100% 
Transient (5 sec) 100-110% 
  
TRANSMISSION  
394 RPM (15.22:1) 
System Oil 5 qt. 

Transmission Oil Pressure 
Min 30 psi 
Normal 30-50 psi 
Max cold wx 70 psi 
Transmission Oil Temperature 
Min 15C 
Max 110C 
Trans Press 30 + 2 psi 

FUEL 
Closed circuit refueling 40 psi 
Old Bravo 76 gal 
New Bravo/ Charlie 91 gal 
Boost pumps 4 - 30 psi 
Fuel pump 700 + 50 psi 
Fuel Pump 3.5 psi 

HYDRAULICS 
System 2.25 pt 
Reservoir 1 pt 
Pump 600 + 50 psi 
Rotor Brake 38 - 30% 
Rotor Brake 100 -120 psi 
HYD PRESS 300 psi / 400 psi 

ELECTRICAL  
Battery 24V/ 17 amp-hr 
Loadmeter  Max 70%  
Loadmeter Max for AC 50% 
Starter/Gen 30V/ 150 A 
Regulated 28V/ 105 A 
Gen Wx Regulations 
28.5 + .5V < 0C 
27.5 + .5V 0C 33C 
27.0 + .5V > 33C 
External Power Unit 28V/ 400 A 
Batt Temp 54 + 3C 
Batt Hot 60 + 3C 

Starter Limitations  
ON 
OFF 
ON 
OFF 
ON 
OFF
APU START
25 sec
30 sec
25 sec
30 sec
25 sec
30 min
BATT START
40 sec
60 sec
40 sec
60 sec
40 sec
30 min
Light-off in 20 sec= On for 60 sec  

CHARLIE  
Stby Batt 22.5V/ 1.8 Amp-hr 
     18 cells of 1.25 V 
Stby Gen 28V/ 7.5 A 

FLIGHT CHARACTERISTICS  
Airspeeds 
Max Fwd 130 kts 
Max Rear 15 kts 
Max Side 25 kts 
Max Turbulence 80 kts 
Max Doors Off 110 kts 
Max Auto 100 kts 
Min Power/Rate of Descent50 kts 
Max Range 72 kts 
Min IFR 65 kts 

Max Sideward/ Rearward Speed  
DA 
0-1000 
1000-2000 
2000-4000 
4000-6000 
6000-10000
SIDE 
25 kt 
20 kt 
15 kt 
10 kt 
5 kt
REAR 
15 kt 
15 kt 
15 kt 
10 kt 
5 kt
Max Forward Speed  
AFCS
OFF
ON
<=3000#
130 kt
122 kt
>3000#
122 kt
122 kt
1K over 3K DA
-3.5 kt
-7 kt
Max Altitudes  
      AFCS Off  
<= 3000 lbs. 
>3000 lbs.
20,000 PA /18,000 DA
16,000 PA/13,000 DA
        AFCS On 
<= 3000 lbs. 
> 3000 lbs.
11,500 PA/13,500 DA
8,5000 PA/11,000 DA 
Accelerations  
Max 2.5g 
Min 0.5g 

Winds Rotor Engagement  
45 off nose (Fwd)    Max 40 kt 
45 off tail (Rear)       Max 17 kt 
Other (side)             M ax 25 kt