Federal Aviation Administration. AC 120.91: Airport Obstacle Analysis. Presented to: FLIGHT STANDARDS SERVICE By: AFS-400 Date: August 3, 2006. PURPOSE. This AC Describes Acceptable Methods And Guidelines Re: Takeoff And Initial Climb-out Airport Obstacle Analysis
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Airport Obstacle Analysis
Presented to: FLIGHT STANDARDS SERVICE
Date: August 3, 2006
FOR TWO ENGINE TURBOJET AIRCRAFT
2.4% - 0.8% = 1.6% (62.5:1 Slope)
One-Engine Inoperative, Vertical (CFR)
CFR Part 25.111.a
Gross Path (CFR)
Net Path (CFR) (Gross - 0.8%)
Min 400’ AGL
1 Engine take-off distance
CFR Take-off Flight Path
Net Takeoff Flight Path=212’
One-Engine Inoperative, Horizontal
(FAR / AC / ICAO)
300’ + wing span
An Engine Failure During Takeoff Is A Non-normal Condition, And Therefore Takes Precedence Over Noise Abatement, Air Traffic, Sids, Dps, And Other Normal Operating Considerations.
AFS-410, FLIGHT OPERATIONS BRANCH, FAA FORM 8260-10
>>The POI Shall Not Issue Ops Specs To An Operator Authorizing This Special IAP Until At Least The Following Two Conditions Are Met To The Satisfaction Of The AWOPM That Has Geographic Responsibility For This Special IAP:
Note: Under No Circumstances Can The OAA Half-width Be Reduced To Less Than The Regulatory Minimums Of 200 Feet Within The Airport Boundaries And 300 Feet After Passing The Boundaries.
[180kts(3 miles per min) x 500 F/Nm = 1500 fpm ]
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