Jeppesen Approach Chart. Runway Elevation in hpa

7 Answers

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   John D Collins on Apr 10, 2020

   Can you refer to a specific chart? Identify the airport ICAO identifier, the procedure name and chart number, where on the chart you referring to and the specific value on that chart.

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   Mark Kolber on Apr 11, 2020

   John, I’m pretty sure he is talking about the box of the Briefing Strip which contains the transition altitude.

   If that’s correct, Kazuya, it’s informational. The Transition Altitude is the altitude when you change from the standard altimeter setting 29.92 inches or 1013.2 hPA to the local altimeter setting. The “hPA” you are seeing after “Alt Set” is just telling you which is used locally. In the US, for example, it says “Alt Set: inches.” In some countries it says “mm”.

   The field elevation hPA next to it is not used in the US, so I am not familiar with how it works. But my limited research (I was curious) indicates that entry is also different in different countries. In examples like yours, it represents the field elevation stated as a difference between QNH and QFE. Jepp refers to this as a “barometric pressure equivalent.” It is for altimeters which use QFE when the setting is reported in QNH. So, for example, if it says “Runway Ele: 50” and reported QNH is 1025, the QFE is 1025-50, or 975.

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   John D Collins on Apr 11, 2020

   Mark,

   I have access to world wide Jeppesen Charts and I don’t see what he is asking about and without a specific example that I could review, I don’t want to answer. It has been over a day since since I posted my response without an answer from him. If he has enough interest to provide the information I requested, I will respond.

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   kazuya_160189 on Apr 11, 2020

   Sir John & Mark.

   Thank you very much for the response and helping me out. I am very much appreciated & apologies for the late reply.

   For John, Please look at any approach chart of RPLL(NINOY AQUINO INTL) for example.

   Below the box of missed approach procedure, there is Rwy Elev giving by hpa.

   I also looked at different countries Jeppesen charts, but not all airports has the info.

   Regards

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   Mark Kolber on Apr 12, 2020

   I thought so.

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   John D Collins on Apr 12, 2020

   I looked at several charts in the Philippines. As Mark indicated, the Hpa alt value is the correction value. The charts indicate that the airport uses Hpa for reporting the altimeter setting (standard is 1013.25 Hpa at sea level)

   Altimeter settings can be given in terms of height above MSL (QFH) where the altimeter reads the field elevation or height above the runway (QFE) where the altimeter reads zero on the airport runway.

   The value “Rwy Elev: n” may be used to convert between a QFE setting and a QFH setting. So QFH setting = QFE setting + Hpa alt. The reverse is true, that is QFE setting = QFH setting – Hpa alt. At low MSL altitude below 5000 ft, 27 feet = 1 Hpa. So for example, if you look at RPLC approach ILS or LOC Rwy 02, the field elevation = 465 feet. Divide this by 27 yields 17.2. The chart shows “Rwy Elev: 17 Hpa.” If the ATIS reports the altimeter setting of 1010 and your operations sets the altimeter to QFE for an approach, it would need to be set to 1010-17 = 993 Hpa.

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   Mark Kolber on Apr 13, 2020

   Kazuya, not all airports *have* the info because, as I explained earlier, not all airports *use* the info.

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