PWM Runway 11 Landing Distance Available

The Jepp 10-9A has a note that says the last 400' of runway 11 is not available for landing.

Why? I don't know.

ORD has a notation for landing distance on runway 10/28 that states the last 754' is not usable for landing computations. Although it doesn't say anything about computations at PWM, it may be for the same reason.:dunno:
 
TFaudree_ERAU said:
The Jepp 10-9A has a note that says the last 400' of runway 11 is not available for landing.

Why? I don't know.

ORD has a notation for landing distance on runway 10/28 that states the last 754' is not usable for landing computations. Although it doesn't say anything about computations at PWM, it may be for the same reason.:dunno:
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Yeah, we don't know why either. It screws with our performance data, so we're trying to figure out why it's there.
 
Every runway is required to have a "safety distance" built into it of 1000'. Runway 29 at Portland only has 600' of safety distance, therefore the additional 400' must come off the runway length. Thus we have a 400' shorter runway 29 for published landing distances, there is still 7200' but to maintain safety for publishing sake it is 6800'.

Edit: I suspect this is built in for us dumb pilots who have trouble with complex addition/subtraction...
 
shdw said:
Every runway is required to have a "safety distance" built into it of 1000'. Runway 29 at Portland only has 600' of safety distance, therefore the additional 400' must come off the runway length. Thus we have a 400' shorter runway 29 for published landing distances, there is still 7200' but to maintain safety for publishing sake it is 6800'.
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Do you mean runway 11? Runway 11 has the shorter ALD of 6800'.

Regardless, I have this question; for this runway (or any runway) with the ALD matching the actual runway length where is the "safety distance" factored in?
 
All the LOC antenna crap is 600 feet from the threshold of 29. After that its a steep dropoff into Portland harbor. All runways have to have a 1000 foot overrun clear area (or equivalent, like EMAS). So for landing distance calculations the "end" of the runway has to be 1000 feet from "bad stuff to hit" which is only 6800 feet from the runway 11 threshold.

If the ALD is the same as the published length then that 1000 feet of overrun clear area is built in past the far threshold before LOC antennas dropoffs and other "bad stuff to hit"
 
Well I fly at SFM (like 20 miles away) and my only guess could be that at the end of runway 11, there is some grass and then it goes down into the water, so maybe it's there for performance data reasons only so someone doesn't cut it real close and end up going in the water.

Just a guess, and it's probably wrong, but whatever. Those last 400' don't really affect the 172 I fly.
 
shdw said:
Every runway is required to have a "safety distance" built into it of 1000'. Runway 29 at Portland only has 600' of safety distance, therefore the additional 400' must come off the runway length. Thus we have a 400' shorter runway 29 for published landing distances, there is still 7200' but to maintain safety for publishing sake it is 6800'.

...
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Ain't no safety distance built-in here.

Check out the slope as well as the difference in elevation of each end of the runway. That part and parcel from the notes and cautions.

http://204.108.4.16/d-tpp/0910/02332N34.PDF
 
shdw said:
Look at what oldtownpilot said. Yes I meant runway 11. Also oldtown and myself (with the exception of screwed up runways) are right, I called the airport to verify. :)
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I'm referring to the PDF I linked. Ain't no safety nothing in there.
 
C150J said:
http://skyvector.com/airport/PWM/Portland-International-Jetport-Airport

Can someone explain to me why the landing distance available for 11 is 400 feet less than 29's for landing? There are no apparent displacements, unless I'm missing something.
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The "Declared Distances" are one option that an airport authority can use to establish Runway Safety Areas.

See this FAA Cert Alert.

Declared distances are sometimes noted on taxi diagrams and airport charts, but those charts are not reliable for those purposes.

The best source of Declared Distance information is the Digital A/FD.

For additional background refer to this Gov't Industry Aeronautical Charting Forum recommendation.
 
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