RC-12X Chapter 5
What is the minimum free air temperature for operation for operation of the deicing boots?
-40C
Max Landing Gear Extension Speed (Vle)
179 KIAS
Gyro Suction
2.8-5.9 Inches of mercury Normal operating range
Max Demonstrated Crosswind Component
20 Knots at 90 degrees
DC Electrical
300 Amps continuous 1000 Amps 5 seconds
N1 Turbine Limitations
62-104% Normal 72% Approx high idle 88% Max reverse 104% Max
Single Engine Minimum Control Airspeed (VMCa)
103 KIAS
Turbulence and Thunderstorm Operations
A. Aircraft will not be flown into known or forecast extreme turbulence or into known severe turbulence. Turbulent air penetration speed is 150 KIAS. The provisions and exceptions for AR 95-1 Apply. B. Aircraft will not be intentionally flown into thunderstorms.
Oil Temperature (Celsius)
-40 Starting -40 to 110 Low idle & Transient 10 to 105 Max cont, max cruise and climb, normal cruise and climb, max reverse 10-110 (5 Min) Takeoff 74-80 Recommended. Max of 110 for 10 minutes.
N2 Prop RPM
1000 Min (unless in feather) 1450-1700 Normal 1650 Max Reverse 1700 Max Continuous 1870 (20 sec) Max transient
Maximum Speed if Windshield Icing
226 KIAS
Maximum Airspeed in Class B and Below 10,000'
250 KIAS
Above what altitude are standby boot pumps required when using JP4?
30,000 Feet
What is the max design sink rate?
500 feet per minute
When shall the ice vanes be extended.
Ambient temperatures of 5C or below when flight free of visible moisture can not be assured.
Fuel Quantity No Take Off Range
0-265 LBS
Cabin Altimeter and Differential Pressure
0-6.5 PSI Normal range 6.5 PSI Maximum
Prohibited Maneuvers
1. Spins 2. Aerobatics of any kind 3. Abrupt Maneuvers above 167 KIAS 4. Any maneuver which results in a positive load factor of 3.02G or a negative load of 1.21G with wing flaps in up or approach; or a positive load factor of 2.0G or 0G with flaps down.
Brake Deice Limitations
1. The brake deice system shall not be operated in ambient temperatures above 15C. 2. The brake deice system shall not be operated longer than 10 minutes (one timer cycle) with the landing gear retracted. If operation does not automatically terminate approximately 10 minutes after gear retraction, turn the brake deice switch off. 3. Maintain 85% N1 of higher during simultaneous operation of the brake deice and surface deice systems. If adequate pneumatic pressure cannot be provided for simultaneous operation of the brake deice and surface deice systems, turn off the brake deice system.
Operation with the FUEL PRESS annunciator light illuminated is limited to _______ hours. Log time (duration) FUEL PRESS light is illumintaed on DA form 2408-13-1.
10 Cumulative hours
What is the time limit for operating the brake deice with the landing gear retracted?
10 Minutes; If operation does not automatically terminate approximately 10 minutes after gear retraction, turn off BRAKE deice switch.
Reference Landing Approach Speed (Vref)
111 KIAS
Safe Single Engine Airspeed (Vsse)
115 KIAS
Pneumatic Pressure
12-20 PSI Normal operating range 20 PSI Maximum
Weight Limitations
13,100 Max zero fuel weight 15,675 Max landing weight 16,500 Max takeoff 16,620 Max ramp weight 238 Max toilet seat weight during takeoff and landing 300 Max air stair door weight
Single Engine En Route Climb Speed (Venr) / Best Single Engine Rate of Climb (Vyse)
130 KIAS
Minimum Speed During Icing
140 KIAS
What is the time limit for pitot heat on the ground?
15 Minutes
Above what altitude are standby boot pumps required when using AVGAS?
15,000 Feet
"CAUTION" Use of AVGAS operation is time-limited to _______ hours during any Time-Between-Overhall (TBO) period. It may be used in any quantity with primary or alternate fuel.
150
Turbulence Penetration Speed (Vb)
150 KIAS
Brake deice shall not be used above what ambient temperature?
15C
Max Landing Gear Retraction Speed
160 KIAS
Cruise Climb Air Speeds
160 KIAS SL to 10,000' at pilots discretion 135 KIAS SL to 10,000' 130 KIAS 10,000' to 20,000' 125 KIAS 20,000' to 25,000' 120 KIAS 25,000' to 35,000'
Design Maneuvering Speed (Va)
167 KIAS
Maximum Design Maneuvering Speed (Va)
167 KIAS
What is the aircraft maximum operating altitude with an inoperative yaw damp.
17,000 Feet
Miscellaneous Limitations
200' AGL Min altitude for autopilot use 15 Min Time limit for pitot heat on the ground 35,000' Max operating altitude 17,000' Max altitude for inoperative yaw damp 6.5 PSI Max cabin differential 500 FPM Max design sink rate ISA+37 Max operating temp to 25,000' ISA+31 Max operating temp above 25,000' 10,000' or Freezing Level Windshield heat on
When an operational limit is exceeded, an appropriate entry shall be made where? What must the entry contain?
2408-13-1; The entry shall state what limit or limits were exceeded, range, time beyond limits, and any additional data that would aid maintenance personnel in the maintenance action that may be required.
If there is a crack in any side window or windshield, aircraft operations are limited to ______ feet or less and cabin pressurization of ____ PSI or less as required to complete the flight.
25,000 feet, 4.0 PSI
Propeller Deice Ammeter
26-32 Amperes normal operation
Fuel System Limitations
265 lbs Minimum for takeoff (mains only) 300 lbs Max fuel imbalance 540 Gal Usable Capacity 10 Hrs With fuel press annunciator on 150 hrs Operating with AVGAS 15,000' Standby boost pumps when using AVGAS 30,000' Standby boost pumps when using JP4
What is the aircraft maximum operating altitude.
35,000 Feet
Starter Limitations
40 seconds on, then 15 minutes off, 40 seconds on, then 30 minutes off.
Flap Position Indicator Takeoff and Approach
40%
Turbine Gas Temperature Limitations (Celsius)
400-830 Normal 750 Max low idle 760 Max Reverse 800 Normal cruise and climb 810 Max cruise and climb 830 Max continuous 840 (5 min) Max takeoff 870 (20 sec) Max transient 1000 (5 sec) Max for starting
Torque Limitations
54% Max below 1000 N2 RPM 75% Max Reverse 83% Max at 1700 N2 RPM 94% Max at 1500 N2 RPM 0-100% Max operating range 100% Continuous 100% Max for takeoff 138% (20 sec) Transient
Oil Pressure (PSI)
60 Min low idle 40-200 Transient 90-135 Takeoff (5 Min), max cont, normal/max cruise and climb, max reverse 200 Max starting Under 90 PSI is undesirable. Emergency conditions lower limit of 60 PSI is permissible at reduced power 54% maximum.
What % N1 must you maintain during simultaneous use of brake and surface deice?
85% N1
Autopilot Limitations
A. An autopilot preflight check must be conducted and found satisfactory prior to each flight on which the autopilot is to be used. B. A pilot must be seated in the pilot's seat at the flight controls with the seat belt fastened when the autopilot is in operations. C. Operation of the autopilot and yaw damper is prohibited during takeoff and landing, and below 200 feet above terrain. Maximum speed for autopilot operation is 248 KIAS to 11, 500 feet, then 0.472 Mach to 35,000 feet.
During refuel operation when can the aux tanks be filled?
After the mains are full.
Max Wing Flap Extension Speeds (Vfe) Approach and Full
Approach (40%) - 197 KIAS Full (100%) - 151 KIAS
Bank and Pitch Limits (degrees)
Bank limits are 60 left and right Pitch limits are 30 above and below the horizon
"CAUTION" Associated With Using Reverse
Except in emergency, propellers should be moved out of reverse below 50 knots to minimize propeller blade erosion, and during crosswind to minimize stress imposed on the propellers, engines, and airframe. Care must be exercised when reversing on runways with loose sand or dust on the surface. Flying gravel will damage propeller blades and dust may impair the pilot's forward visibility at low aircraft speeds.
Generator Load Limits
Generator Load / Minimum Gas Generator RPM - N1 0-95% / 65% 95-100% / 70%
The aircraft shall not be operated when the ambient temperatures are warmer than _____ at sea level to ______ or _____ above ______.
ISA+37 at sea level to 25,000' or ISA+31 above 25,000'
Cracked Cabin Window or Windshield
If a crack occurs in any side window or windshield, aircraft operation is limited to 25,000 feet or less and cabin pressurization of 4.0 PSI or less as required to complete the flight. The aircraft shall not be flown again until maintenance actions are conducted unless proper authorization is obtained for a ferry flight to a location where a maintenance action can be performed. If a crack develops in any side window or windshield in flight, refer to chapter 9, emergency procedures.
"CAUTION" Associated With Aircraft Temperature Limits
If an aircraft is sitting in the sun and the outside temperature reaches 55C (131F), the cabin temperature could reach 82C (180F). under these conditions, measures must be taken to lower the cabin temperature or damage could result.
"CAUTION" Associated With Fuel Management.
JP-8 fuel per MIL-T-5624 has anti-icing additive per MIL-DTL-85470 blended in the fuel at the refinery and no further treatment is necessary. Some fuel suppliers blend in anti-icing additive, in their storage tanks. Prior to refueling, check with the fuel supplier to determine if fuel has been blended. To assure proper concentration by volume of fuel onboard, blend enough additive for the unblended fuel.
"WARNING" Associated With Crosswind Limitations
Landing with wind conditions in excess of the demonstrated crosswind component may result in damage to the aircraft. This should only be attempted during emergency situations.
Pitot Heat Limitations
Pitot heat should not be used for more than 15 minutes while the aircraft is on the ground.
Max Allowable Airspeed (Vmo/Vne)
Refer to flight envelope chart (fig 5-2) to determine limiting air speeds at maximum gross weight under various conditions. 248 KIAS below 11,500' 0.472 Mach between 11,500' to 35,000'
What is the Minimum crew required for this aircraft?
Two Pilots; Additional crew members as required will be added at the discretion of the commander, in accordance with pertinent Department of Army regulations.
Landing Gear Cycling Limitations
When conduction training operations, the landing gear cyclic rate shall not exceed 5 complete (extension and retraction) cycles equally spaced in a 20 minute period, without allowing 10-15 minute interval between 20 minute time groupings. The cycle rate should not exceed 10 cycles equal spaced in 1 hour. This rate is to keep the power pack motor operations within an intermittent duty class.
"WARNING" Associated With Icing Conditions
While in icing conditions, if there is an unexplained 30% increase of torque needed to maintain airspeed in level flight, a cumulative total of two or more inches of ice accumulation on the wing, an unexplained decrease of 15 KIAS, or an unexplained deviation between pilot's and copilot's airspeed indicators, the icing enviroment should be exited as soon as practicable. Ice accumulation on the pitot tube assemblies could cause complete loss of airspeed indication. 2x15=30 Rule 2 inches or more of ice accumulation on the wing 15 KIAS decrease after entering icing conditions 30% increase in required TQ to maintain desired airspeed Any variations from normal indicated airspeed, between the pilot and copilot airspeed tapes.
