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= + + + + + + +
=
2 2 2 2 2 2
2 2 2 2 2 2
4
3
210132 1745432 4 546117 31445 75 77 4680 11020 20
3
3596163
. . . . . .
.
ROCpfaf =bg−ISADpfaf+ anpe +wpr +fte +ASEpfaf +VAEpfaf +atis
= + + + + + + +
=
Calculating the Obstacle Clearance Surface (OCS) Slope Ratio
The OCS slope is calculated by taking the difference in heights of the OCS surface at
ROCpfaf and ROC250:
( ) ( )
250
250 250
tan
pfaf ltpelev
OCSslope
pfaf ROCpfaf ROC
θ
 − − 
 
=  
− − −
Calculating the OCS LTP to Origin Distance
The OCS origin is calculated by taking the distance from threshold of the 250 ft point of
the designed glidepath and subtracting the distance along the OCS slope from zero to
the ROC250 point.
250 (250 250)
tan
OCSorigin tch ROC OCSslope
θ
= − − − ⋅
 
FAA Form 1320-19 (8-89)
Directive Feedback Information
Please submit any written comments or recommendations for improving this directive, or suggest new
items or subjects to be added to it. Also, if you find an error, please tell us about it.
Subject: Order 8260.RNP SAAAR, United States Standard for Required Navigation Performance (RNP)
Approach Procedures with Special Aircraft and Aircrew Authorization Required (SAAAR)
To: DOT/FAA
Flight Procedure Standards Branch, AFS-420
P.O. Box 25082
Oklahoma City, OK 73125
(Please check all appropriate line items)
􀂅 An error (procedural or typographical) has been noted in paragraph _______ on page ______.
􀂅 Recommend paragraph ______ on page ______ be changed as follows:
(attach separate sheet if necessary)
􀂅 In a future change to this directive, please include coverage on the following subject:
(briefly describe what you want added):
􀂅 Other comments:
􀂅 I would like to discuss the above. Please contact me.
Submitted by: _____________________________ Date: __________________
FTS Telephone Number: Routing Symbol: ________

　
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