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HAAB Declared Distances

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HAAB Declared Distances

Old 24th Apr 2018, 16:54
  #1 (permalink)  
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Join Date: Jun 2014
Location: Earth
Posts: 663
HAAB Declared Distances

I'm trying to help some college students complete an assignment to see whether they can take off from HAAB in a 787-8 at a given MTOM.

To achieve this I need to know the TORA, TODA and ASDA values for HAAB/ADD airport. Would anyone here be so kind as to give the values if they've access? I have somewhat given up after extensive googling and this is the last resort, none of my pilot friends with EFBs have HAAB on it

I'd prefer the longer 07L/25R values please considering we're testing the thing to the max.

All help would be immensely appreciated,

Cheers

P.S. They have been provided with a Boeing graph that gives Takeoff length V Takeoff mass so all I need is to see what the limiting length would be (tora, asda or toda)
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Old 24th Apr 2018, 17:06
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Join Date: Sep 2010
Location: repeatedly crossing the equator
Age: 34
Posts: 116
Originally Posted by Officer Kite View Post
I'm trying to help some college students complete an assignment to see whether they can take off from HAAB in a 787-8 at a given MTOM.

To achieve this I need to know the TORA, TODA and ASDA values for HAAB/ADD airport. Would anyone here be so kind as to give the values if they've access? I have somewhat given up after extensive googling and this is the last resort, none of my pilot friends with EFBs have HAAB on it

I'd prefer the longer 07L/25R values please considering we're testing the thing to the max.

All help would be immensely appreciated,

Cheers

P.S. They have been provided with a Boeing graph that gives Takeoff length V Takeoff mass so all I need is to see what the limiting length would be (tora, asda or toda)


Sure thing,

HAAB
07R
TORA:3800m
TODA:3890m
ASDA:3890m
slope: -0.16%

25L
TORA:3800m
TODA:3890m
ASDA:3890m
Slope:0.16%

07L
TORA:3700m
TODA:3760m
ASDA:3760m
Slope:-0.11%

25R
TORA:3700m
TODA:3760m
ASDA:3760m
Slope: 0.11%
kibz2005 is offline  
Old 24th Apr 2018, 17:07
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You are my hero, sir

Thanks!!
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Old 24th Apr 2018, 17:08
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Join Date: Sep 2010
Location: repeatedly crossing the equator
Age: 34
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Originally Posted by Officer Kite View Post
You are my here, sir

Hah, by passing on knowledge you sir are the real hero. All the best
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Old 25th Apr 2018, 12:14
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Join Date: Aug 2000
Location: Monrovia / Liberia
Age: 59
Posts: 744
According to my logbook, I have personally landed (and taken-off) from Addis Ababa [HAAB] / [ADD] on 56 occasions.

The temperature there is typically between +15șC and +25șC and the QNH is most often in a range of 1025mb to 1030mb.
Certain times of the year has frequent rain showers (i.e. wet runway) along with thunderstorms (i.e. windshear).
Given all the previous, coupled with the high airfield elevation, ones TAS can be very high (for takeoff, plus approach & landing... almost to the extent that tyre speeds can be limiting and energy management is crucial during the approach).
Have a look at / calculate the Density Altitude and also the True Altitude and what that does to descent rates (especially for the RNAV approaches from the west).
It's also the case that 250 knots below 10,000 ft needs to be planned for and adjusted to take account of the airfield's very high elevation (and local topography) for both take-off and approach!
Due to the topography to the west of the airfield (see pic, which was taken looking west towards R25 L/R), take-offs from, and go-arounds towards, Runways 25 (L/R) have emergency turns and / or are WAT limited.
The quoted runway gradients do not reflect reality, wherein those are based on a calculation of the the difference between the elevations at either end of the runway divided by the runway length. What they don't depict is that R25 (L/R) have an uphill slope for about 60% of their length, followed by a flat'ish spot for about 25% of their length, and then a fairly steep downslope for the remaining 15% of their length. It's the case that when you takeoff from R07R you are unable to see over & beyond the flat spot which is now in front of you, and so you'd better listen carefully to ATC and keep good SA to ensure that the runway beyond that flat spot is clear of other aircraft / vehicles / workers (of which there are lots milling about along the runway's edge, e.g. bird scarers waving their arms about and / or general workmen. TIA! ).

As those who've been there will attest, it can be a tricky place when the weather is bad, i.e. with African sized Cb's in the rainy season.
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Last edited by Old King Coal; 26th Apr 2018 at 05:00.
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