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Q400 Limitations Flashcards
Maximum Operating Ambient Temperature   (M)
+50°C or ISA + 35°C, 
whichever is less
Minimum Operating Ambient Temperature  (M)
Maximum Operating Altitude  (M)
Maximum Altitude Takeoff & Landing  (M)
VFE Flaps 5°  (M)
200 KIAS
VFE Flaps 10°  (M)
181 KIAS
VFE Flaps 15°  (M)
172 KIAS
VFE Flaps 35°  (M)
158 KIAS
200 KIAS
215 KIAS
Rough Air Speed  (M)
210 KIAS
Maximum Tire Speed  (M)
182 KIAS
Starter Cranking Limits  (M)
70 seconds On, 2 minutes Off M

70 seconds On, 2 minutes Off 
70 seconds On, 30 minutes Off
Engine Ice Protection  (M)
Engine intake bypass doors must be open for engine operation in icing conditions.
Icing Conditions on Ground 
(Definition)  (M)
SAT is 10°C or below when precipitation in any form is present, or fog with visibility of one mile or less; 
also when operating on ramps, taxiways or runways where surface snow, ice, slush, or standing water may be ingested by the engines or freeze on engines, nacelles, or engine sensor probes.
Icing Conditions in Flight 
(Definition)  (M)
SAT 5°C or below and visible moisture is present in any form.
Maximum Crosswind  (M)
32 knots
Maximum Fuel Imbalance  (M)
(Inflight limitation only)
Aux Fuel Pumps  (M)
Tank 1 and tank 2 auxiliary pumps must be on for takeoff and landing.
Electrical System Limitations  (M)
  1. Standby, Auxiliary and Main battery maximum loadmeter reading for takeoff is 0.1
  2. Minimum battery temperature for takeoff is -20°C.
Landing Gear & Flaps  (M)
Maximum altitude for extending landing gear or wing flap is 15,000′
Takeoff Power Setting Limitation  (M)
Setting takeoff power prior to brake release, with the nose of the airplane more than 45° out of wind, is prohibited for wind speeds greater than eight knots.
Engine Airborne Operating Limitations  (M)
Inflight operation of the Power Levers aft of the FLIGHT IDLE gate is prohibited.
Maximum Cabin Pressure Differential  (M)
5.95 psi
Maximum Cabin Pressure Differential, 
Takeoff & Landing  (M)
0.5 psi
Bleed Air Limits, 
Takeoff  (M)
Bleed Air must be off for Takeoff whenever: 

  • Tailwind component exceeds 10 knots
  • Takeoff is conducted with MTOP power selected
  • Windshear is suspected
Bleed Air Limits, 
Landing  (M)
Bleed Air must be off for Landing whenever: 

  • Tailwind component exceeds 10 knots
  • Reported OAT exceeds 39°C (100°F)
  • Windshear is suspected
AHRS Limitations  (M)
Takeoff in BASIC mode is prohibited 

Takeoff in DG mode is prohibited
Baggage Compartment Fire Extinguishing Limitation
Unless the forward and aft baggage compartments are empty, the airplane shall not be operated farther than one hour flying time from a suitable airport for landing.
Flight Compartment Communications  (M)
HOT MIC select switches on the Captain and First Officer ARCDU shall be OFF and the INT/RAD switch on the observer's Audio Control Panel shall be centered, when using the flightdeck speakers.
APU Limitations  (M)
  • APU is approved for GROUND OPERATION ONLY.
  • APU shall be shutdown prior to takeoff.
  • APU shall not be operated unattended with passengers on board.
  • APU shall not be started during refueling.
  • APU shall not be operated unattended during pressure refueling.
  • APU shall not be operated during gravity refueling.
  • APU ambient temperature limitations
(Lower) -35°C 
(Upper) +50°C or ISA+35°C, whichever is less 

APU starter cranking limits 
60 seconds ON, 5 minutes OFF 
60 seconds ON, 30 minutes OFF
AFCS Limitation  (M)
Use of VOR without associated DME is prohibited in APP mode.
Autopilot Limitations  (M)
• During autopilot operation, the pilot shall be seated at the controls with harness secured. 
• After takeoff or go-around, the minimum height for autopilot engagement is 1,000 feet AGL. 
• Autopilot shall be disengaged in severe icing. 
• Autopilot shall be disengaged in severe or extreme atmospheric turbulence. 
• Autopilot (coupled) and Flight Director (manual) approaches are approved from a nominal glideslope angle of 2.5° to maximum of 4°. 
• AFCS is approved for autopilot coupled approaches to CAT I limits only. 
• Autopilot coupled approaches are approved for: 
- Flap 0° (minimum altitude: 1,000 feet AGL) 
- Flap 5°, 10°, 15°, and 35° 
• Autopilot coupled approaches have been demonstrated in crosswind components up to 18 knots. This is not considered limiting. 
• Autopilot shall be disengaged prior to FAF for: 
- HGS approaches flown in AIII mode 
- Approaches flown with an inoperative engine 
• For all autopilot coupled approaches, the autopilot shall be disengaged at or above a minimum altitude of 200 feet AGL.
Maximum Ramp Weight
65,400 lbs
Maximum Takeoff Weight
65,200 lbs
Maximum Landing Weight
62,000 lbs
Maximum Zero Fuel Weight
58,000 lbs
Forward Cargo Compartment Limits
Max Load - 390 lbs 
Max Floor Loading - 125 lb/ft2
Aft Cargo Compartment 
(Aft One)
Max Load - 3660 lbs 
Max Floor Loading - 125 lb/ft2
Aft Cargo Compartment, Aft Step
(Aft Two)
Max Load - 1000 lbs 
Max Total Load - 3660 lbs (Aft 1 + Aft 2) 
Max Floor Loading - 75 lb/ft2
Maximum Total Load Aft Cargo 
(Main Floor + Aft Step)
3660 lbs
0 - 8,000′     245 KIAS 
10,000′         282 KIAS 
18,000′        286 KIAS 
20,000′        275 KIAS 
25,000′        248 KIAS
204 KIAS
MTOP Time Limit
10 minutes
Minimum Oil Temperature required for Power settings above Flight Idle
Minimum Oil Temperature required to ensure engine air inlet ice protection, prior to takeoff
Minimum Oil Temperature required to ensure engine air inlet ice protection, in flight and within 3 minutes of setting takeoff power
Reduced NP Landings Prohibited
  • Landings are accomplished at Solid Bug - VREF (ICE)
  • Performance requires Bleeds OFF
  • Tailwind component exceeds 10 knots
  • Windshear is reported or suspected
  • Runway is contaminated or braking action is less than good
Maximum Tailwind Takeoff & Landing
20 knots
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