Normal operation

Question 1

After how many hours a new full IRS alignment has to be performed?

OM B 2.1 CM2 preparation

Answer 1

A new full alignment, accomplished by rotating the IRS Mode Selectors to OFF and back to NAV, must be accomplished when the accumulated time from last full alignment will exceed 18 hours.

Question 2

What is the max. Altimeter difference between all 3 altimeters at SL?
What is the max. difference to the apron elevation?

More details: OM B 2.2.10.4

Answer 2

At SL max. difference between altimeters is 40 ft.

Max. difference to the apron elevation is 75 ft.

Question 3

Which stabilizer trim settings require use of alternate stabilizer trim switches?
B 757
B 767

Answer 3

B 757
Settings less than 3.0 units require alternate stab trim use.

B 767
Settings less than 1.5 units require alternate stab trim use.

Question 4

At what nose up attitude will normally the lift off occur during takeoff?
B757/B767

At what pitch attitude will the aft fuselage contact the runway (tail strike)?
B757/B767

Answer 4

Lift off will occur prior to reaching 7.5° nose up attitude on both B757 and B767.

On B757 tail strike will occur at 9.5° pitch attitude.

On B767 tail strike will occur at 9.6° pitch attitude.

Question 5

Max. Difference between Standby Magnetic Compass and CM1/2 EHSI’s?

Answer 5

Max. Difference is +/-8 degrees,

exceedance shall be reported via TLB