Extreme WX. NATOPS CH. 14

Question 1

How does extreme cold temp effect aircraft material?

Answer 1

1. Rubber, plastic, and fabric material stiffen, and may crack or even shatter, when loads are applied
2. Oils congeal and grease hardens
3. Dissimilar metals contract differently
4. Moisturizer freezes in critical areas
5. Tire, landing gear strut and accumulator air px decrease as temp decreases

Question 2

During cold WX, what may a difficult to move PCL indicate?

Answer 2

A difficult to move PCL may be indicative of a frozen PAS or PAS cable. DO NOT force PCL movement.

Question 3

During Cold WX, when do you expect to see an OIL FILTER BYPASS caution?

Answer 3

The impending bypass indicator has a thermal lockout below 38*C to prevent the PDI button from popping.

Question 4

What should you be aware of when starting an engine that has been exposed to low temps overnight?

Answer 4

1. Watch for a ride in TGT within 40 sec
2. If no rise in TGT, prime engine and attempt another start
3. If no overboard fuel fellow during prime, inspect for ice in dumps and filters

Question 5

Time for TA battery charging when in air temps are above 5*C?

Answer 5

Normal charging time required before unfolding the array or transmitting actively is approx 10 min after mission power applied (ST/R powered on)

Question 6

Time for TA battery charging when in air temps are 5*C or below?

Answer 6

Up to 45 min may be req

Question 7

What is the min usable charge of the sonar transducer battery in flight?

Answer 7

10%

Question 8

How long should it take for the TA battery to reach at least 60%?

Answer 8

1 hour after mission power applied in temps above 5C or 1.5 hours for temps below 5C

Question 9

Torque available reduction and fuel flow increase with ECS on HOT?

Answer 9

Approx 5% per engine and 45 lbs per hour per engine

Question 10

APU fuel consumption if powering ECS?

Answer 10

Approx 150 lbs per hour

Question 11

When and why should ENG ANTI-ICE switched be turned on?

Answer 11

When OAT is 5*C or below in visible moisture.
When engines are operating in those the conditions, the engine inlet guide canes and the inlet are susceptible to icing.

Question 12

What might high pitched noise with no secondary indications or power loss indicate?

Answer 12

Ice damage to the T700 engine

Question 13

Where will initial ice accumulation be noted?

Answer 13

On the windshield wiper arms, mirror support brackets, main landing gear, and external stores.

Question 14

What shall you do when entering visible moisture at ambient temps of 5*C or below?

Answer 14

All anti-ice and de-ice systems shall be turned on prior to entering.

Question 15

Ice accumulation torque values

Answer 15

1. An increase of over 10% matches torque should result in urgent consideration to vacate the environment, unless the task is considered essential. If torque required increases 20% above that required for level flight, at the airspeed prior to entering icing, exit icing environment or land as soon as possible.
2. Additional torque increase up to 14% per engine may be experienced due to ice buildup during normal operation of the blade de-ice system.
3. Ice accumulation resulting in 20% torque increase ( 10% per eng) indicates that normal autorotational rotor RPM may not be attainable should dual eng failure occur.

Question 16

When shall Pitot heat be turned on?

Answer 16

When OAT is 5*C or below OR when visible moisture is present.

Question 17

What action to take during Hot WX ground ops, if eng oil px falls into the red range or ENGINE OIL PRESS caution appears when the PCL is in IDLE?

Answer 17

Slightly advance the PCL. If engine oil px returns to yellow and ENG OIL PRESS caution disappears, engine oil px is acceptable