Federal Aviation Administration Airport 20 to 1 Approach Surface Georgia Airports Association (GAA)...

Federal AviationAdministration

Airport 20 to 1 Approach Surface

Georgia Airports Association (GAA) Annual Workshop

Cindy M Hintz Eastern Flight Procedures Team

March 14, 2014


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20:1 Approach Penetrations

• Criteria developed by Flight Standards in the late 1990s• Requires clear 20:1 approach surface for night

minimums• Visual aids (VGSI) such as VASI or PAPI were

designated as a possible mitigation• All terminal procedures are currently reviewed every

two years, as required by AFS policy.• During that periodic review, or other amendments, the

TERPS Specialist in AeroNav Products may identify obstacles that penetrate the 20:1 visual surface.


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20:1 Penetrations (continued)

• Background: During Oct 2012, Flight Standards Division AFS-400 required immediate NOTAM action resulting in “Not Authorized (NA) at night when 20:1 identified.

• Current Policy: Effective Jan 6, 2014, refined policy considered “Risk” factor of the identified penetrations and allowing a validation period (30 days).

• Validation: To verify if the obstacle exists or has been removed, and/or if the obstacle is lighted.


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20 to 1 Approach Surface (TERPS)


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20 to 1 Penetrations

• Identified/reported by various offices: EFPT, ANP, GDOT, FC and soon, Geographic Information System (GIS) tool

- Mandatory biennial reviews / OKC ANP

- During instrument procedure amdts

• Result in loss of night time capability

• Daytime visibility restricted to 1 SM


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Identification of 20 to 1 Penetrations

Typical scenario:

•During biennial review of airport’s procedure(s) OKC development branch identifies non-validated penetrations.

- - Specialist’s findings are forwarded to EFPT, assigning each penetration with risk assessment of high, medium or low.

- - EFPT adds GoogleEarth overlay to the file (.kml)


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20 to 1 penetrations (cont)

- - Within 3-business days, file is forwarded to airport requiring sponsor to validate each penetration ASAP, but no more than 30-days / ADO copied

•Airport owner/sponsor must provide a written report and copy ADO

•No response received within prescribed timeframe will result in IAP visibility minima and night capability as required.


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Airport Owner / Sponsor Response

• If 20 to 1 penetrations determined invalid - - EFPT will notify applicable offices to update airport’s data file(s); no action required to restrict or modify subject IAP.

• If 20 to 1 penetrations determined valid:

- - Submit written compliance plan

- - Remove, light or lower

- - Actions taken per risk Assessment criteria


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Possible Mitigation Actions

• Visual Glideslope Indicator (VGSI)

- Apt Mgr submits Form seeking AFS approval

• Apply ILS / LOC / LPV / LP Full-Scale Deflection

- Calculation, conducted by ANP when trying to

mitigate 20:1 penetration vs restricting night mins

• Restrict only CAT C/D approach category minimums vs restricting CAT A/B/C/D

- If penetrations are outside CAT A/B area


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Mitigate by Aircraft Category

• Most common GA 20 to 1 issue

- - Runway type often, e.g., BII

- - Charted minima CAT C/D

- - CAT A/B begins at +/- 200 FT

- - CAT C/D begins at +/- 400 FT

• Airport cannot clear larger surface area

- - Other mitigation N/A (VGSI/Deflection)

- - Restrict CAT C/D minima only


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Jim Hamilton L.B. Owens (KCUB), SC

• RWY 31 20 to 1 penetrations

- Clearing project lasting several years

- Received official notification

- Provided compliance plan, VGSI checklist and

initiated flight check within 30 day window

- EFPT forwarded to OKC requesting temporary

VGSI mitigation and requested OKC ANP perform

check of full-scale deflection and evaluate CAT

A/B vs CAT C/D penetration(s)


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VDP or DA


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Thank you

Questions?


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Contact Info

• Cindy M Hintz• Eastern Flight Procedures Team• 404-305-5956, [email protected]

Federal Aviation Administration Airport 20 to 1 Approach Surface Georgia Airports Association (GAA)...

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