TH-67 Chapter 5 Flashcards
EXCEEDING OPERATIONAL LIMITS
Intentional use of transient limits is prohibited. Anytime an operational limit is exceeded an appropriate entry shall be made on DA Form 2408-13-1. Entry shall state what limit or limits were exceeded, range, time beyond limits, and any additional data that would aid maintenance personnel in the inspection that is required.
MINIMUM CREW REQUIREMENTS
a. VFR configured helicopter is approved for single pilot operations during day, night, and non-icing conditions.
b. Minimum flight crew for VFR operations is one pilot who shall operate the helicopter from the right crew seat. The left crew seat may be used for an additional pilot when approved dual controls are installed.
c. IFR configured helicopter is approved for single pilot VFR, and two pilots (one in right front seat and one in left front seat) for IFR/IMC operations during day, night, and non-icing conditions.
d. A+ Minimum flight crew for VFR operations is one pilot who shall operate the helicopter from the right crew seat. Minimum fight crew for NVG operations is two pilots (one in right front seat and one in left front seat)
Instrument markings and placards
The minimum and maximum limits nd the normal and cautionary ranges for the helicopter and its subsystems are indicated by instrument markings and placards. The instrument markings and placards represent careful aerodynamic calculations that are substantiated by flight test data.
ENGINE OIL TEMPERATURE AND PRESSURE GAUGE
ENGINE OIL TEMPERATURE
- 0º C - 107º C Continuous Operation
- 107º C Maximum
ENGINE OIL PRESSURE
- 50 PSI Minimum below 78% N1
- 90 PSI Minimum from 78% to 94% N1
- 115 PSI Minimum above 94% N1, double wide arc
- 50 PSI Minimum, 130 PSI Maximum
NOTE
During cold temperature operation the oil pressure may exceed the maximum of 130 PSI. Stabilize the engine idle speed of 60 to 64% until the engine oil temperature is above 0º C and the engine oil pressure is within normal limits.
TRANSMISSION OIL PRESSURE AND TEMP
TRANSMISSION OIL PRESSURE
▩ 30 to 50 PSI Continuous Operation
▩ 30 PSI Minimum, 70 PSI Maximum
TRANSMISSION OIL TEMPERATURE
▩ 15º C to 110º C Continuous Operation
▩ 110º C Maximum
LOADMETER AND FUEL PRESSURE GAUGE
LOADMETER
▩ 70% Maximum
FUEL PRESSURE
▩ 4.0 PSI Minimum
▩ 4.0 PSI to 30 PSI Continuous Operation
▩ 30 PSI Maximum
► 8 PSI Minimum using TYPE A, A-1, JP-5, JP-8 Fuels below -18 °C (0 °F) to -32 °C (-25 °F)
AIRSPEED INDICATOR
NOTE
Autorotation above 100 KIAS will result in high rates of descent and low rotor RPM.
▩ 0 to 130 Knots Continuous Operation
▩ 130 Knots Maximum
▩ 100 Knots Maximum for Autorotation
VNE for internal Gross Weight above 3,200 pounds is 78 KIAS, not to exceed placarded VNE.
TURBINE OUTLET TEMPERATURE GAUGE
TURBINE OUTLET TEMPERATURE GAUGE
NOTE
The Red Warning light illuminates when either of the following conditions are exceeded: 810°C to 927°C for 10 seconds or higher than 927°C
▩ 100° to 738° Continuous Operation
▩ 738° to 810° Take-off Power Range (5 minute limit)
▩ 810°C Maximum
810°C to 843°C, 6 second transient limit (Not to be used intentionally)
🔴 927°C Maximum during starting and shutdown, 10 seconds maximum
GAS PRODUCER (N1)
GAS PRODUCER
▩ 60 to 105% Continuous Operation
▩ 105% Maximum
105% to 106% transient (15 seconds maximum)
DUAL TACHOMETER
ROTOR INDICATOR
▩ 90% Minimum Operation
▩ 50 to 60% Accelerate through this range
▩ 90 to 107% Normal Operation
▩ 107% Maximum
Power on Transient Rotor Droop Limit is 95%, 5 seconds maximum
POWER TURBINE INDICATOR
▩ 97% Minimum Operation
▩ 97 to 100% Continuous Operation
▩ 100% Maximum
N2 75% to 88%
60 seconds maximum (time not cumulative)
N2 TRANSIENT OVERSPEED LIMITS
“Student needs to explain graph (figure 5-9, se nederst) verbally”
N2 Transient overspeed limit is 15 seconds maximum. Shaded area represents allowable overspeed.
Explanation:
- N2 transient overspeed is dependant upon engine torque.*
- 0 - 32% Engine torque: 107% Engine RPM.*
- 32% - 100% Engine torque: gradually decreases to decreases to 103% Engine RPM at 100% torque.*
TORQUE METER
▩ 0 to 85% Continuous Operation
▩ > 85 to 100% Take-off Power Range (5 minute limit)
▩ 100% Maximum
Transient Torque Limit is 100 to 110% (5 seconds maximum)
INTENSIONAL USE IS PROHIBITED
FUEL QUANTITY GAUGE
▩ On Empty
ALTITUDE LIMITATIONS
a. 3000 pounds gross weight AND BELOW
Maximum operating
- VFR: 20,000 feet PRESSURE altitude
- IFR: 14,000 feet PRESSURE altitude
b. ABOVE 3000 pounds gross weight
Maximum operating
- VFR: 13,500 feet PRESSURE altitude
- IFR: 8,000 feet PRESSURE altitude
ENGINE RPM LIMITATIONS
⚠ WARNING
Use of the throttle to control RPM is not authorized. Refer to Chapter 9 Emergency Procedures and the USSAWC flight training guide for exceptions.
TURBINE OUTLET TEMPERATURE (TOT) LIMITS (Caution, Para 5-20)
⚠ CAUTION
Exceeding the limits of 810°C TOT or 100% Torque may cause N1 topping with resultant rotor droop.
WIND LIMITATIONS
WIND LIMITATIONS
a. The Helicopter can be started in a maximum wind velocity of 45 knots and a maximum gust spread of 15 knots.
NOTE
Gust spreads are not normally reported. To obtain spread, compare minimum and maximum velocities.
b. Maximum wind for hovering is 35 knots crosswind and 30 knots tailwind.
c. For Hover operations at gross weights above 3200 lbs:
- IGE maneuvers - refer to chapter 8
- OGE maneuvers - calm wind only.
FUEL BOOST PUMP LIMITATIONS
Fuel boost pumps shall be ON during normal operations.