Info please from 737-800 pilots

[enicalyth]

The enicalyth needs to know what the Boeing Laptop Tool (BLT) or the Honeywell thingy says about take off at the putative St Helena airport. B737-800; 145000lb BRW; 27300lb thrust per engine; airport alt 1100ft; 20degC/68degF OAT; 1018hPa/30.06in Hg; Dew Point 15degC/59degF/73% rel Humidity; runway level and wet. Also breakdown of fuel under ICAO rules for 93000lb OWE. 115000lb ZFW and 1700nm to Cape Town with 250nm alternate. Enicalyths only know about 777-200ER and 747-400 so help me to help St Helena ASAP.

[enicalyth]

It's the enicalyth again. Somebody can help. I am 777/747 & not 737 and just asking someone to tap into the BLT if they have one in the despatch office or else tap the info into the old wotsit. I have translated the met conditions using wahiduddin since i don't think new guys are taught it anymore. Okay then, you are at FACT in a 737-800. Runway smooth and wet. Elev 151ft 30degC OAT 1017mB dew point 15degC (or 48% relative humidity). BRW is 65750kg. Can't someone just tell what JAR runway length is spat out like I would if'n you asked a 777/747 question? If you are American make it 145000lb 86deg F OAT 30.07in Hg 59deg F dew point, still 48% rel humidity and still 94.28% relative density. Which is what it will be typically be at 1100ft in St Helena if they get around to building an airport. Now please, guys, it ain't difficult for a bobby jockey to reply is it? Fickle 7 out.

[Dehavillanddriver]

tell them to pay a consultant!

The question isn't as easy to answer as you might think...

[Capt Chambo]

Here are some back of the envelope type figures for the question you asked. They are for a BBJ2 so they are relevant for an -800 with winglets.

The figures are from the manual and not the BLT if you want the BLT figures then you will need to give me either the ICAO aor IATA three/four letter code and I will see if it's in our database.

From the manuals:- 2000' Pressure altitude, 20C QNH 1018, you will be field limited (assuming no close in obstacles), Flaps 5, engines 27.3K RWY req.d approx. 6600'
V speeds wet V1 127KIAS, VR 137KIAS, V2 148 KIAS.

For your Fuel question;- again from the books.

1700nm 40 kt H/W =1856 air miles. Which requires 18500lbs of fuel and flight time is approx. 0405hrs

Alt 250nm H/W -20 kts = 260 airmiles. Worst case scenario at 10,000'=5400lbs and takes 00:51 mins. More realistic FL280 = 3500lbs and 00:46 mins.

NBAA fuel reqd. taxi 500lbs, trip 18500lbs, Alternate 5400lbs, 00:45 mins reserve (@MLW and 1500') 3850 lbs Total 28250 lbs.

Hope that helps.

All usual caveats apply!

[enicalyth]

Cap’n Chambo

You are a real gent. Thanx for the kind offer, so if you could please tap into the BBJ BLT this specimen.

FAJS/JNB Rwy 03R/21L TORA/TODA/ASDA/LDA = 3400m
Elev 5577ft
Temp 30 deg C
Dew Point 15 deg C
Rel Humidity 49%
Wind zero
Pressure 1022hPa

Flaps ?? (your call) engines 27.3k

[Capt Chambo]

We have no flight planning as such in the BLT merely T/O and landing performance. So what is it you want to know exactly and I will get back you you in a "few" days time.

There are flight planning programmes out there, but we always use a third party/agency to do ours so I can only offer figures from the manuals.

The BLT and me are seperated so bear with me for a few days and I will get back to you.

[Capt Chambo]

First of all the usual caveats apply here, and the numbers should all be double/triple checked before even thinking of using them for any sort of flight planning......OK so having established that, herewith the numbers that I get out of the BLT.

I have NO figures for runway 03L or 03R, and I don't know why but these are some numbers for runways 21L and 21R.

Ambient conditions as you describe, RW 21L, Engines27.3K, AC Bleeds OFF, Flap 5 (Optimum), RTOW=164,190 lbs, and your Vspeeds are 150,150,154.

If your operation allows there is an option to ignore close in obstacles and your RTOW becomes 164,190lbs, with the same V speeds.

RW 21R, same ambient conditions, Engines 27.3K, AC bleeds off, Flaps 1 (Optimum) RTOW=169,610 lbs, V speeds 151,159,162 (and you are Vmbe limited).

Again if you are allowed to ignore close in obstacles then the RTOW increases to 170,720lbs Vspeeds are 150,160,163.

These figures all apply to a Boeing 737-800 BBJ2 with the winglets.

What is an "Enicalyth"?

Hope this helps.

[enicalyth]

As I did not specify I take it that the BLT figures are dry runway. The "enicalyth" is, with a minor bit of cheating a backward "thylacine" or Tasmanian wild striped dog. Reputedly extinct. Does all sorts of things like dislocate its jaw to swallow prey. Dog at the front; Tiger at the back; funny tail. (Bit like an Airbus A318 then). When sighted convinces hardened outback heroes to lay off the booze for a coupla weeks. Me being considerably backward, out in the sun too long, always confused I am THE enicalyth. Godzone, Green and Gold, Bouncy Animal Airlines and proud of it. Now let's have a Toohey's or Two. Admiral Nelson's my pub or else anywhere in the Rocks. Chiz Chambo. You're a star.

[Capt Chambo]

Confirming those figures were for a dry runway.