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TOPIC: APAPI Lights

APAPI Lights 10 May 2018 04:56 #1

  • Waseem
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Hi all,

I require eye to wheel height (EWH) of Twin Otter Aircraft (DHC-6 400 series) to calculate the distance of APAPI lights from Threshold. Specification for the Twin Otter is available but no information pertaining to EWH is mentioned over there.

I have also gone through ICAO Part 4 Visual Aids Appendix 6 as well but EWH is not listed for DHC-6.

What should be the possible way to calculate the EWH?

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APAPI Lights 10 May 2018 18:16 #2

  • Ossington_2008
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If you don't get an answer here (not my area of expertise) try the pprune website. I'm sure someone there will know, or at least know where to look.
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APAPI Lights 30 Jun 2018 14:03 #3

  • TerryClark
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Normally it's 50ft for all aircraft except 'heavies'.
With aircraft with excessive EWH such as B747, C5 etc, an extra set of PAPI's wil be provided giving extra clearance.

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Last Edit: by TerryClark.

APAPI Lights 30 Jun 2018 14:37 #4

  • Carnaby
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TerryClark wrote: With aircraft with excessive EWH such as B747, C5 etc, an extra set of PAPI's wil be provided giving extra clearance.


I have an old guide for Heathrow which states that three sets of PAPIs are provided:

1) International

2) International Jumbo

and (scroll down):
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.3) French !

EDIT: Terry suggested below VASIs - it was an old manual. He's probably correct,

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Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite :twisted:.
Last Edit: by Carnaby. Reason: EDIT comment added

APAPI Lights 30 Jun 2018 15:42 #5

  • TerryClark
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Maybe 3 sets of VASIs but I never heard of 3 sets of PAPIs.
Anyway the OP asked about APAPIs which stands for 'Abbreviated' PAPIs ie 2 lights per system instead of 4 and only intended for use on smaller airfileds.

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APAPI Lights 01 Jul 2018 06:58 #6

  • TerryClark
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Just in case you're really looking for MEHT (Minimum Eye Height, above Threshold), Fairoaks used to have the BAS Twin Otters in for maintenance and their figures are:-
R/W 06 3.5 deg GP MEHT 14ft
R/W 24 4 deg GP MEHT 20ft.
The APAPIs are about 50m upwind of each threshold.

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