Topics not covered in the manual

grue

Hi,

While the included manual is quite thorough some topics seem to be missing, e.g.:

Required runway length charts for take-off and landing;
Take-off flap setting. The manual is a bit vague:
"Select the take-off flap setting appropriate to the prevailing airfield conditions and the scheduled performance data"
18 degrees seem to be the default but it would be nice to have more info on this;
Emergency procedures. Some failures are available in the sim for this model but it is not described how to handle them.

Is this covered / going to be covered somewhere?
Thanks and sorry if I am missing it in plain sight.

flightstrike

@grue Just off the top of my head, about 2000m RWY is acceptable for Take off at heavy weights. The amount of "Flex" used would be quite low (high N1). Generally, Flap 18 is the preferred flap setting for TO. It provides the best overall climb gradient. On short runways, Flap 24 and even Flap 30 can be used. But Flap 30 especially can cause gradient issues once airborne.

Landing Flap is generally Flap 33. Some aircraft can land Flap 24. There's a button just to the right of the Landing Gear lever if this is approved. Landing distance at heavy weights, Flap 33 is about 1200m. The brakes will be HOT! Brake temps above 750C require maintenance. They must be below 300C before the next take off.

I don't believe much is provided with regards to failures. I'll look into this for you.

jmarkows

@flightstrike Do you have a good example on how to work through/figure an appropriate flex value?

I was flying in the US southwest today and temps were about 30C, so I just winged it and used 46. This worked ok in KPHX where the elevation is only about 1100, but leaving KRNO where it's 4400ft and trying a flaps 24 takeoff I almost ran out of runway before I hit Vr and as you said, the climb gradient was not great until I hit V2+10 to retract to flaps 18.

galeair

@jmarkows Hi.
I created a runway performance spreadsheet specifically for the Bae146, and have subsequently enlarged it to include other aircraft. I tested it on the P3D version, and am now about to start testing on the MSFS.
It can be downloaded from Flightsim. to and is free. I include the link below:

https://flightsim.to/file/24722/aircraft-runway-performance-spreadsheet

I would welcome any feed back and will monitor the Just Flight website for comments and try to provide assistance.

Genista

Thanks a lot for sharing your answers !

If I may ask, I was wondering the following:

What is the technical reason behind the FCOM requirement to turn on ENG anti ice prior to engine start ? And why do we have to turn off the packs for startup despite starters being electrical ?
Is there any situation where the cabin/flight compartment fans would be turned off ?

flightstrike

@genista said in Topics not covered in the manual:

Thanks a lot for sharing your answers !

If I may ask, I was wondering the following:

What is the technical reason behind the FCOM requirement to turn on ENG anti ice prior to engine start ? And why do we have to turn off the packs for startup despite starters being electrical ?

Is there any situation where the cabin/flight compartment fans would be turned off ?

ENG Anti-Ice is on during start for stall/surge protection. They're switched off after each start. We switch them back on when we shut down.

The Packs and APU air are switched off prior to start to reduce the overall load on the APU. When you're out in the sticks and the APU fails during a start, you've got problems...

The Cabin Air is generally left on 100% of the time. This may vary between operators. The Flight Deck Air is generally on when it's a hot day. But it's annoyingly noisy!