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Glossary of ATR 42 Limitations

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Minimum Flight Crew
2 Pilots
Maximum Operating Altitude
25000 FT
Manuvering Limit Load Factors
Flaps Retracted +2.5 to -1 G
Flaps Extended +2.0 to 0 G
Gear Down +2.0 to 0 G
Cargo Door Operation
Do not operate cargo door with a cross wind component of more than 45 kt.
Design Weight Limits
Taxi
Take Off
Landing
Zero Fuel
Taxi = 37632
Take Off = 37258
Landing = 36160
Zero Fuel = 34259
Airspeeds
Vmo
Mmo

Va

Vfe 15
Vfe 30
Vfe 45

Vle
Vlo

Vra

Vwo

Maximum Tire Speed
Vmo = 250
Mmo = 0.55

Va = 160

Vfe 15 = 160
Vfe 30 = 150
Vfe 45 = 130

Vle = 170
Vlo = 160

Vra = 180

Vwo = 160

Max Tire Speed = 165 Ground speed
Take Off & Landing

Max Tail wind

Demonstrated cross wind

Take Off
Landing flaps 30
Landing Flaps 45

Max runway slope
Max tail wind = 10 kt

Demonstrated cross wind
Take off = 45 kt
Landing 30 = 38 kt
landing 45 = 20 kt

Max slope = + or - 2%
PW 120 Engine Temps
Max starting
Transient
Hotel mode
Max Cont
Take off
Reserve take off
Start 950 for 5 sec
Transient 850 for 20 sec
Hotel mode 785
Max Cont 785
Take off 785
Reserve T/O 816
Ground operations

If wind is above 15 kt?

With prop in feather?
If wind is above 15 kt avoid operations between 41% & 65% NP

Avoid operations above 50% torque with prop feathered
Icing conditions prop limitation
Use of NP below 86% in icing conditions is prohibited
Starter limitations
3 starts with a combined time of 1 min 30 sec followed by 4 min off
Fuel system

Usable fuels
Jet A
Jet A1
Jet B No cross feed above 20 C
JP 4 is Prohibited
JP 5
Max Fueling pressure
50 psi
Max usable fuel
9920 lbs
Max fuel imbalance
1212 lbs
Fuel Pump Feeding
Each electric pump is able tosupply one engine in the whole flight envelope.

Each jet pump is able to supply both engines in the whole flight envelope except for take off
Pressurization

Maximum differential pressure
Maximum negative differential pressure
Maximum differential pressure for landing
Maximum differential pressure for OVBD valve open selction
Maximum bleed off operation altitude
Maximum differential pressure = 6.35 psi
Maximum negative differential pressure = -0.5 psi
Maximum differential pressure for landing = 0.35 psi
Maximum differential pressure for OVBD valve open selction = 1.0 psi
Maximum bleed off operation altitude = 20,000 ft
Electrical System

DC GEN max load & time interval

Inverter max load & time interval

ACW GEN max load & time interval
DC GEN
400A - None
600A - 2 min
800A - 8 sec

Inverter
500VA - None
575VA - 30 min
750VA - 5 min

ACW Gen
20 KVA - None
30 KVA - 5 min
40 KVA - 5 sec

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