[bvipilots] Re: Fuel question
- From: Noel Romey <nromey@xxxxxxxxx>
- To: bvipilots@xxxxxxxxxxxxx
- Date: Tue, 3 Sep 2013 05:57:32 -0400
Stupid question, are you guys using the acars panal to see what amount
of fuel you have? Or is there some other command I could use? I'm
unsure.
Noel
On 9/3/13, Robert Cezar <robert@xxxxxxxxxxxxxxx> wrote:
> Hello.
>
> REGARDING: Fuel Question
>
> For expediency, rather than writing a detailed answer to your question, I
> have decided to share the following communication I had with an IYP user
> who asked precisely the same question. I responded with an in-depth
> explanation below.
>
> ===========================================
> START OF CUSTOMER COMMUNICATION
>
> Hi Robert,
>
> Here's an example set of files for a flight where Michelle reports the
> wrong fuel value. In this case, it didn't happen during the ground
> checklists, but as we approached the descent phase. The value she gave was
> 1,096 pounds. Later this increased to 1,912 pounds. Then it went down
> again to
> 1,314 pounds. Then it went up to 2,504 pounds, and so on. I've included
> the voice transcript file so you can see. Like I say... gremlins. :-)
>
> All the best,
>
> David
>
> END OF CUSTOMER COMMUNICATION
> ===========================================
>
> ===========================================
> START OF MY RESPONSE
>
> Hello David,
>
> Well, upon review, actually there were no Gremlins! <G>
>
> Let me explain this carefully. Michelle loaded 45,216 pounds of fuel. This
> value includes the flight, plus reserves for taxiing at both ends,
> additional fuel for winds aloft, and yet more fuel to be able to perfect a
> minimum of one Go-Around (more likely two Go-Arounds) or a diversion to an
> alternate airport.
>
> HOWEVER...
>
> The aforementioned considerations assume typical "real-world" flight
> planning.
>
> First, let me dispense with the constant fuel updates issue. This is
> Michelle (acting like a Gremlin) automatically adding fuel (while
> in-flight), so that you will never get to EMPTY. With that said, let's
> find out why you were running on fumes!
>
> I conducted the exact flight as you had performed, using the files you had
> sent me.. the PLN, FLT and WX.
>
> TEST PARAMETERS:
>
> Instead of having Michelle load the 45,216 pounds of fuel (which would be
> too little as per above), I loaded the MAXIMUM fuel possible with the given
> payload, in the amount of 52,185 pounds.
>
> TEST ONE: (using your exact flight)
>
> Cruising Altitude: 28,000 feet.
> Starting Fuel: 52,185 Pounds
> Top Of Climb (TOC) Fuel: 47,727 Pounds
> Top Of Descent (TOD) Fuel: 12,515 Pounds
> Landing Fuel: 9, 833 Pounds
>
> Fuel Consumed During Climb Out: 4,458 Pounds
> Fuel Consumed During Cruising: 35,212 Pounds
> Fuel Consumed During Descent: 2,682 Pounds
> Fuel Consumption Per Hour: 1,435 Pounds
> Total Fuel Consumed: 42,352 Pounds
>
> Cruising KIAS: 315 Knots
> Mach Speed: .74
>
> TEST TWO: (using a cruising altitude of 38,000)
>
> Cruising Altitude: 38,000 feet.
> Starting Fuel: 52,185 Pounds
> Top Of Climb (TOC) Fuel: 47,033 Pounds
> Top Of Descent (TOD) Fuel: 19,748 Pounds
> Landing Fuel: 17,174 Pounds
>
> Fuel Consumed During Climb Out: 5,152 Pounds
> Fuel Consumed During Cruising: 27,285 Pounds
> Fuel Consumed During Descent: 2,574 Pounds
> Fuel Consumption Per Hour: 1,185 Pounds
> Total Fuel Consumed: 35,011 Pounds
>
> Cruising KIAS: 255 Knots
> Mach Speed: .79
>
> NOTE: I landed on Runway 21 on TEST ONE, however, due to changes in the
> weather, I was assigned Runway 03 on TEST TWO. This means, that I needed to
> fly downwind, so the flight was a little longer.
>
> SUMMARY:
>
> As you can see, when Michelle initially loaded 45,216 pounds and you
> consumed 42,352 pounds by flying at 28,000 feet, you had insufficient fuel
> for a flight of this length. Ergo, Michelle periodically "added fuel" so
> the passengers would not die!
>
> By conducting the same flight at a more suitable cruising altitude of
> 38,000 feet, the total fuel consumption was significantly less... only
> 35,001, thereby leaving 10,215 pounds of reserve for Go-Around(s) or a
> diversion to an alternate airport.
>
> There are three sections in the IYP Flight Deck Doc that I'd like you to
> read:
>
> On PAGE 29: Calculating Fuel Consumption
> On PAGE 56: Calculating Your Cruising Altitude
> On PAGE 66: Airspeed Control
>
> BTW, you can review the ACARS/PIREP for both of these flights in the IYP
> Pilots Lounge under:
>
> PIREP - Complete Pilot Reporting and ACARS Log Book
>
> I hope this missive helps. <SMILES>
>
> Regards,
> Robert
>
> END OF MY RESPONSE
> ===========================================
>
> This should adequately answer your question.
>
> Robert
>
>
>
>
> On Tue, Sep 3, 2013 at 12:35 AM, Robert Cezar
> <robert@xxxxxxxxxxxxxxx>wrote:
>
>> Hello,
>>
>> What aircraft are you referencing?
>>
>> Please advise.
>>
>>
>> On Mon, Sep 2, 2013 at 11:31 PM, Jordan Gallacher <
>> jordanandseptember@xxxxxxxxx> wrote:
>>
>>> I have a fuel question. When the fuel gets around 95 gallons, it
>>> automatically goes back up to 130 gallons. Anyone know of a solution to
>>> this?
>>> Jordan
>>>
>>> Sent from my iPhoneBlind and Visually impaired Pilots mailinglist
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>>
>>
>>
>> --
>>
>>
>> AOPA Member No: 06936977
>>
>>
>
>
> --
>
>
> AOPA Member No: 06936977
>
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