Limitations - Engines & APU

Question 1

APU Bleed and Electrical Load (max altitude)

Answer 1

10,000 feet

Question 2

APU Bleed Load (max altitude)

Answer 2

17,000 feet

Question 3

APU Electrical Load (max altitude)

Answer 3

41,000 feet

Question 4

Use of Assumed Temperature Prohibited when…

Answer 4

• Anti-skid inoperative

* Runway is contaminated

Question 5

Define “Icing Conditions” on the Ground

Answer 5

Ground Icing Conditions exist when
• The OAT is 10ºC or below; and
• Visible moisture in any form is present; or
• When operating on ramps, taxiways or runways where surface snow, ice, standing water or slush may be ingested by the engines or freeze on engines or nacelles

Question 6

Define “Icing Conditions” in flight

Answer 6

Icing Conditions exist in flight (climb and cruise) when:
• The TAT is 10ºC or below; and
• The SAT is -40ºC or above; and
• Visible moisture in any form is present (clouds, fog, rain, snow, sleet, ice crystals)

Engine anti-ice must be on prior to and during descent in all Icing Conditions, including temperatures below -40ºC.

Question 7

Minimum Oil Temperature for Engine Start

Answer 7

-40ºC

Question 8

Minimum Fuel Temperature for Engine Start

Answer 8

Must not be less than -43ºC or 3ºC above the fuel freezing point temperature, whichever is higher

Question 9

Engine Ignition Use in Flight

Answer 9

CONT for Moderate to Heavy Rain, Hail or Sleet

FLT for Severe Turbulence

Question 10

Minimum Oil Temperature for Takeoff

Answer 10

31ºC

Question 11

APU bleed valve must be closed when (3 items)

Answer 11

• ground air connected and isolation valve is open
• engine no. 1 bleed valve is open
• isolation and engine no. 2 bleed valves open

Question 12

APU Start Attempts

Answer 12

After three consecutive aborted start attempts, a 15-minute cooling period is required.

Question 13

Engine Ignition Use on Ground

Answer 13

• Left Ignition for odd flight numbers
• Right Ignition for first flight and even flight numbers
• For first flight of the day, at airports at or above 2,000 ASL, if the temperature is below 5ºC / 41ºF, consider placing ignition to BOTH

Question 14

Engine Starter Limits

Answer 14

• Multiple consecutive start attempts are permitted; each start attempt limited to 3 minutes with 10 second break
• Extended engine motoring limited to 5 minutes with a 5 minute break between first two motorings. For third and subsequent motorings a 10 minute break is required.

Question 15

Aborted Engine Start Parameters

Answer 15

• N1 or N2 does not increase (or increases very slowly) after EGT increases
• No oil pressure indication by the time the engine is at idle
• EGT does not increase by 15 seconds after Engine Start Lever is moved to IDLE detent
• EGT quickly nears or exceeds the start limit

Question 16

APU as Bleed Air Source

Answer 16

Run the APU for two full minutes before using it as a bleed air source

Question 17

Minimum Oil Pressure for Takeoff

Answer 17

17.4 psid