Questions tagged [obstacle-clearance]
For questions on obstacle clearance, whether en route or on a procedure (departure and arrival), including the operational and regulatory aspects.
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Why are only engine-out SIDs constructed and no engine-out missed approach procedures?
Standard instrument departures (SIDs) are normally designed with a climb gradient of $3.3$% according to PANS-OPS in Europe. In case of an engine failure on a twin-engine aeroplane, there is a ...
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The word "Standard" in Departure Procedures
This may seem like a repeat of a question that has already been asked (How to interpret the term standard which is found in FAA's obstacle departure), but I wanted some additional clarification. Does ...
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What's the minimum climb gradient when the MEA changes without an MCA?
If the MEA changes at a navaid, fix, or waypoint along an airway, and there is no MCA, you can begin the climb to the new MEA at the fix. I was wondering what minimum climb gradient is assumed by the ...
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What does TRMSN mean in takeoff obstacle notes?
In the takeoff obstacle notes for KMDT Rwy 31, it lists a Trmsn tower. What does Trmsn mean?
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Is 200FPNM required up to the MSA or to the MOCA in the PLMTO3 SID
On the PLMTO3 SID out of KCHS, Rwy 15 has standard takeoff mins.
From the AIM 5-2-9.e.1.
Unless specified otherwise, required obstacle clearance for all departures, including diverse, is based on the ...
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EOSID - Adhere to at or soon after V1?
Most airports have an Engine Out Standard Instrument Departure (EOSID) statement similar to this on their charts:
For EOSIDs, the take-off performance for "ABC Airport" is based on the ...
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MOC for CAT III missed approach segment
Hello what is the MOC (minimum obstacle clearance) for missed approach segment for CAT III ILS minimum ?
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If an Airport has only a VCOA and a SID, does the VCOA count as an ODP, and if not, does that mean you can fly a diverse departure?
KGRF has a SID requiring a climb gradient of 469 FPNM for obstacles. In the takeoff minimums section, there are takeoff minimums listed for a VOCA (Visual Climb Over Airport) but nothing else. My ...
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Why do heli PC2 operations require highest obstacle clearance
In designing a helipad I notice that the Australian requirements (AC139.R-01) for obstacle clear gradients specify that the slope category (12.5% slope) generally applies to PC2 operations, whereas ...
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What is the difference between MOCA and OCA?
Can someone explain me the difference between minimum obstacle clearance altitude and obstacle clearance altitude? I read definitions in Doc 8168 but i don't really see the difference. I would be ...
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What's IFR departure procedure from private field with encroaching obstacles but no published ODP?
So, this question's answer says that, absent a published ODP, I should be 35' above DER, and on a 200'/NM climb.
But the airfield in the town I grew up in, 26MA, has no ODP; but 200'/NM isn't even ...
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How should this ODP be flown at KELP?
The KELP (El Paso) Obstacle Departure Procedure (ODP) says:
Rwy 4, 8R: climbing right turn heading 120° and ELP R-150 to 9000, then proceed on course.
Rwy 22, 26L: climbing left turn heading 120° and ...
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During an LPV or GLS final approach, can the extension of the aircraft's cross-section line intersect with the Y or X OCS surfaces?
I am studying Obstacle Clearance Surface construction using FAA's Performance Base Navigation manual 8260.58B as my guide. I am confused about the rules concerning aircraft's permitted altitude in ...
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A Question about Departure Procedures at KLRU
The Las Cruces International Airport has the following text in the Takeoff Minimums and ODP document:
LAS CRUCES, NM
LAS CRUCES INTL (LRU)
TAKEOFF MINIMUMS AND (OBSTACLE)
DEPARTURE ...
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What is the difference in purpose of the 1:40 Obstacle Identification Surface and the 1:50 clearance plane for an ILS glideslope?
I have found references to the Obstacle Identification Surface (OIS), which is approximately a 152ft/NM slope from the end of the runway (1.43 degrees, 1:40 rise/run) and a 1:50 clearance plane noted ...
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