Cold Weather Operational Limits

Question 1

What should be done if OAT is < -20?

Answer 1

Batteries heated and APU oil heated with EXT AC Power.

Consider preheating engines, cabin and flight deck.

APU display could be unreadable if cockpit not preheated.

Question 2

What should be done if OAT is < 0 degrees.

Answer 2

With OAT < 0 degrees and cold aircraft, wait until a cockpit temperature of 18 degrees or 65 *F is achieved and maintained for 30 minutes before turning on any electric cockpit equipment.

Question 3

What should be done if Engine Oil Temperature is < -10*C?

Answer 3

Perform crank cycle and ensure positive LP and MAX motoring before placing fuel control to run.

Question 4

What should be done if Taxi OAT < 10*C and icing conditions exist?

Answer 4

Accelerate engine to 40% LP for 10 seconds every 60 minutes.

Engine Anti-ice (EAI) and Wing Anti-ice (WAI) turned ON.

Question 5

What should be done during Take Off (TO) with OAT < 0*C and in icing conditions?

Answer 5

Accelerate engine to 40% LP, pause, and check VIB levels, and then set T/O thrust.

Question 6

What do you do for Engine Ice Accretion in Flight?

Answer 6

One power lever at a time may be quickly retarded to idle, held there for 5 seconds and then pushed momentarily to 90% LP RPM.

This will reduce the vibration indication and the power lever may be returned to its original position.

Question 7

What should be done if OAT is < -30?

Answer 7

The batteries need to be heated and APU oil heated with EXT AC.

The engines are heated (hot air) and cranked before START.

Consider preheating cabin and flight deck with hot air.