ATR 42-300 limitations
 

I need to solve the test. 3 questions reargding ATR42-300 appeared there. I cannot find FCOM for 300. Can someone help me?

1) The easiest.
Weights:
Taxi: 17070 T/O: 16900 Landing 16400. Correct? Need only confirmation I found these data somewhere else.


2. You have conditions: Take off is 2500 m. Runway contaminated by water, deposit 1/4 inch. Outside temperature is +10C. Weight for T/O is 15t. In this case Vr is: 97, 99 or 95kts.

2. You have conditions: Take off is 2500 m. Runway is dry and clear Outside temperature is +15C. Weight for T/O is 11,5t. In this case Vr is: 92, 99 or 90kts.

In the ATR42-500 there are no such a low VR ;-)

THX.

1. Correct

2. don't remember, would have to check the FCOM.

Najlepiej idz do Marty w pokoju 2.12 i pozycz FCOMa od 42-300 - a jak nie bedziesz umial tego znalezc, pm me :}

1. Yup. Those numbers are the ones I remember too.

2. I returned my FCOMs and QRH a year ago so I can't check up the exact values. IIRC there was addition of 1 kt to V1/Vr to values from the tables with up to 3mm water equivalent and 2kt with more than that.

3. 92 kt was our lowest V1/VR on 42-300, limited by VMCA. It was used in the normal conditions for weights below 14.5t. PW120 engine on -300 has RTO power of 2000bhp while I'm not sure about -500 but I think its PW127 output is somewhere north of 2400 bhp - hence the difference. If density altitude is not high, conditions are normal and there are no MEL items, 42-300 has really no use for the runway beyond first 1500m. Once upon a time I took of from 1100m rwy at 300ft elevation with OAT 28° C and RWC said our MTOW was structurally limited. Go figure.

Cheers, C. (not-stuck-in-the-ATR-any-longer)