Ch. 5 Flashcards by eric mcvay

Eng Oil Press Limits

Min Press for NG Ground Idle: 5 psi

Min Press for NG 80-95%: 32 psi

Min Press for NG equal to or greater than 95%: 50 psi

Normal Operation: 35-90 psi

Maximum for Contingency Power: 110 psi

Maximum for Cold WX starts: 150 psi

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Eng Oil Temerature Limits

149^o C

The displays appear in green when the temperature is equal to or less than 149^oC and change to red, with the respective ENG1 (2) OIL HOT caution displayed, when the temperature is greater than 149^oC.

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Transmission Oil Temperature Limits

140^o C

The displays appear in green when the temperature is less than or equal to, 140^oC and change to red when the temperature is greater than 140^oC with the respective COMB, AFT, or FWD XMSN OIL HOT caution displayed.

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Engine Transmission Oil Temperature Limits

The displays appear in green when the temperature is equal to, or less than 140^oC and change to red, with an ENG1 (2) XMSN OIL HOT caution displayed, when the temperature is greater than 140^oC. An ENG1 (2) XMSN warning will be displayed when the temperature is greater than 190^oC.

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Transmission Oil Pressure Limits

Minimum at Ground Idle: 7 psi

Minimum at 100% NR: 20 psi

Normal Operation: 20-90 psi

The displays appear in green when the pressure is equal to or greater than 20 psi and change to red when the pressure is less than 20 psi and NR is equal to, or greater than 25%.

An ENG1, ENG2, COMB, AFT, or FWD XMSN PRESS LO caution is displayed if the pressure in any transmission is less than 20 psi and NR is equal to or greater than 25%.

An ENG1, ENG2, COMB, AFT, or FWD XMSN PRESS HI advisory is displayed when the pressure in any transmission is greater than 90 psi.

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Hydraulic Pressure Limitations

FLIGHT CONTROL HYDRAULIC PRESSURE

Low Limit: 2,500 psi

Normal: 2,500-3,200 psi

High Limit: 3,200 psi

UTILITY HYDRAULIC PRESSURE

Low Limit: 2,500 psi

Normal: 2,500-3,500 psi

High Limit: 3,500 psi

The respective NO 1, (NO2) HYD FLT CONTR caution will be displayed when hydraulic pressure is less than approximately 1,800 psi.

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Hydraulic System Temperature

Red/White 120^oC Maximum

Yellow/White 95^oC to 120^oC

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Rotor Limitations

Minimum transient power-on: 91%

Transient: 91-97%

Normal: 97-101%

Transient: 101-106%

Maximum transient power-on: 106%

Maximum during autorotation: 108%

Maximum transient: 111%

Should 108% NR power-off be inadvertently exceeded, no entry need be made on DA from 2408-13-1 unless the rotor system accelerates and exceeds 111.5% NR. Even though no action is required when NR exceeds 108% power-off, but remains at or below 111.5 %, willful operation shall not be conducted in this range.

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Cruise Guide Indicator (CGI) Inop Limit

Flight equal to or less than 98% NR with an inoperative CGI is prohibited.

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Starting and Shutdown Limits

APU shall not be started with a tailwind in excess of 25 knots. Main engines shall not be started with a tailwind in excess of 10 kts. If it becomes necessary to shutdown in conditions outside the limits shown in Figures 5-3 and 5-4, the following precautions are recommended:
1. A/C should land in an area which is clear, as level as possible, and at least 300 feet away from any vertical obstructions, abrupt changes in ground terrain, trees, bushes, fences, etc.
2. A/C should be oriented such that the wind would be coming in at the left side.

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Power Limits CAUTION

“CAUTION”

For pre-mission Performance Planning, Intermediate Torque Available (30-Minute Operation) is the maximum power authorized for departure and arrival at or below 40 KCAS. Continuous Torque Available is the maximum power authorized for cruise flight.

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Engine Temperature Limits

Maximum Continuous: 816^oC
Maximum for not more 30 minutes: 854^oC
Maximum for not more 10 minutes: 899^oC
Maximum for not more 2.5 minutes: 932^oC
- (Contingency Power)
Maximum Transient for not more 12 sec: 943^oC
- (never exceed)
Maximum Transient for not more 4 sec: >943^oC
- (never exceed)*

*-31 ECU only

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Contingency Power

Contingency power is only to be used during actual emergency conditions. Usage of contigency power up to 932^oC PTIT is permissible for an unlimited number of occurrences, as long as each occurrence is 2 min. 30 sec. or less. Transient power 932^o to 943^oC PTIT is not greater than 12 sec.

If PTIT in either engine is equal to or greater than 932^o ENG 1 (2) 12S TMP advisory will be displayed, also a ENG 1 (2) TEMP HI (CAUTION) will be displayed.

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Gas Generator (NG) Limits

Ground Idle minimum: 50%

Maximum: 111%

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Power Turbine (NP) Limits

Maximum: 111.5 %

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Engine Overspeed

An engine overspeed exists when a speed of 111% NG is exceeded. An NG overspeed can cause over-temperature and/or over-torque.

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Engine Torque (TQ) Limits

Maximum dual engine: 100%

Maximum single engine: 123%

“NOTE”

Average torque is displyed on the VSD. Should an engine failure occur, the actual TQ of the operating engine will be displayed. When the torque split between the two engines is greater than 10%, the value of the maximum TQ line on the INST page will change from 100% to 123%.

A voice alert “TORQUE” will be triggered when TQ is greater than 95% dual or single engine.

Loading Limits

Maximum allowable operating GW: 50,000 lbs.

FWD/ AFT: 17,000 lbs. EA

Tandem: 25,000 lbs.

Center: 26,000 lbs.

When a combination of internal and external loads are carried during the same flight and the external load exceeds 12,000 lbs. position internal load forward of the utility hatch.

Winch/Rescue Hoist Limits

The winch shall not exceed:

(1) 3,000 pounds straight line pull
(2) 6,000 pounds one pulley
(3) 9,000 pounds two pulleys
(4) 12,000 pounds three pulleys

The rescue hoist is limited to a maximum load of 600 pounds.

Cruise Guide Indicator (CGI) Limits

Any excursion in to the red or yellow band for more than 45 sec. requires an entry on DA Form 2408-13-1.

Info required:

FAT
PA
GW
KCAS
Total time in red or yellow band
Needle position w/in red or yellow band

“WARNING”

Sustained operation in the red and yellow band on the CGI will cause damage to the rotor dynamic components resulting in failure of parts, destruction of A/C, and injury or death to crew.

Airspeed Limitations

A Dual FADEC primary channel failure may occur when rearward flight or a tailwind exceeds 40 KCAS. These conditions should be avoided.
Max crosswind or sideward flight is 45 knots
Max A/S for rearward flight is 40 KCAS
Max tailwind for hover is 40 KCAS
Max A/S for lower section of cabin door open and locked is 60 KCAS
Rescue hatch door shall not be opened/closed above 90 KCAS
Windshield wipers shall be off at A/S above 130 KCAS
Upper section of the cabin entrance-ensure that A/S is less than 100 KCAS before closing door in flight
VNE at negative density altitudes 170 KCAS
VNE at positive density altitudes 170 KTAS

-Left side escape hatch: Do not install or remove hatch in forward flight.

External Cargo A/S Limits

-If slingload or hook should fail while carrying a tandem load, limit airspeed to a maximum of 60 KCAS

Longitudinal Cyclic Trim (LCT) Actuator A/S Limits

Do not manually extend the LCT beyond GND position on the cyclic trim indicators at calibrated A/S below 60 KCAS.

Digital Advanced Flight Control System (DAFCS) Limits (A/S)

A/S limit with single DAFCS off is 100 KCAS or VNE, whichever is slower
A/S limit with both DAFCS off is 160 KCAS of VNE, whichever is slower, provided both DAFCS are disabled below 100 KCAS

Aerobatics

Aerobatics are prohibited with this helicopter. Aerobatics are defined as intentional maneuvers beyond **_+/- 30_****^o** pitch and/or **_60_****^o** roll.

Bank Limitations

1. With an operative CGI, bank angles are limited by the CGI, but no greater than **_60_^o**. 2. When operating with BALT/ RALT engaged, limit bank angles to **_45_^o** maximum.

Landing Limitations

Max G/S for roll-on landing is **60 KGS** Max nose up attitude during landings is **20^o** _Max rate of descents at touchdown:_ **Up to 33,000 lbs = 492 fpm** **33,000 - 40,000 = 450 fpm** **40,000 & above = 360 fpm**

Ground Operation Limitations

Right/Left Directional Pedal: **0.75 in** Aft Cyclic: **2.00 in** Lateral Cyclic: **1.00 in** THRUST CONT Lever: **No lower than ground detent** When ground taxiing less than **_75 feet_** from an obstruction on an unimproved/unfamiliar airfield not designated for CH-47F helicopters, a blade watcher and taxi director shall be positioned...

Flight Under IMC

This helicopter is qualified for IMC flight provided the following conditions exist: 1. **_Both DAFCS are operational_** 2. **_Both SFDs are operational_** 3. **_Three MFDs (1, 4, and either 2 or 3), two CDUs, two GPPUs, two DCUs, two EGIs, and two ADCs are operational_** 4. Coupled ILS approaches at localizer intercept angles of greater than **_60_^o** are prohibited "NOTE" Should one DAFCS fail during IMC flight, the flight may be continued to destination. Should both DAFCS fail during IMC flight, exit IMC as soon as practical.

Shock Absorber Vent Valve

The shock absorber vent valve must be open for operation below **_-18°C**_. The valve must be closed for operation above _**-1°C**_. Dangerous ground and flight conditions can result if the valve is in the wrong position. At _**-18°C**_ to _**-1°C_** the valve may be opened or closed.

Flight in Ice

Continuous flight in light icing conditions below **_-5 C_** is not recommended since blade damage can occur from asymmetric ice shedding. Intentional flight into known icing conditions with rotor blade erosion protection materials installed is **_prohibited_**.

Thunderstorm Ops.

To ensure adequate lightning strike protection, the lightning protection **_cables_** and **_straps_** must be installed and intact on all rotor blades. If any lightning **_cables_** or **_straps_** are missing or broken, **_avoid_** flight in or near thunderstorms, especially in areas of **_observed_** or **_anticipated_** lightning discharges.

Operation with Skis

- The maximum allowable airspeed is limited to **_130 KCAS_** or Vne, whichever is slower. - The maximum allowable rate of descent at touchdown in snow is **_480 fpm**_ at gross weights up to 33,000 pounds, decreasing linearly to _**240 fpm**_ at 46,000 pounds gross weight. For gross weights 46,000 pounds to 50,000 pounds, the rate of descent is _**240 fpm_**. - The maximum taxi speed is **_5 knots_** when operating on hard prepared surfaces.

Over Water Ops. Limits

Day/Night/NVG Ops. over water is permissible provided: * **_Both DAFCS operational_** * **_Pilot and copilot radar altimeter is operational_** * **_A visible horizon is present at the operation site_** * **_Helicopter drain plugs are installed_** **"Note"** Water Landing mission can no longer be performed w/out damaging equipment.

Air-to-Ground Towing

Air-to-ground towing operations are **_prohibited_**.

APU Operation

APU operation in flight is **_prohibited**_ except during _**emergencies_**.

Pitot Tube and Static Port Operation

The PITOT HEAT switch shall not be on for more than **_5 minutes_** on the ground.

Windshield Heat

Windshield heat shall not be used above **_24^oC_**

Single Point Refueling

The max rate for pressure refueling is **_300 gal/min.**_ at _**55 psi_.**

Extended Range Fuel System II (ERFS II/RSERFS)

- The maximum capacity of one ERFS II tank assembly is **_825.5_** US gallons when gravity refueled. - The usable fuel in one ERFS II tank assembly is **_800_** US gallons when single point pressure refueled. - The maximum internal pressure of the ERFS II tank should not exceed **_5 psi_**. - The maximum allowable suction defueling pressure is **_-11_** **_psi_**.

Emergency Fuel

Only those fuels listed in Chapter 2 shall be used. Emergency fuel shall not be used for more than **_6_** hours cumulative time.