# SAIB HQ-16-25: SBAS-capable FMS and GPS Equipment With No LP capability

- Type: Special airworthiness information bulletin (advisory, not mandatory)
- Status: Current
- Revision: 0
- Issued: September 28, 2016
- Products: Navigation Space-based augmentation system (SBAS) capable equipment
- Product type: Appliance
- PDF: https://openairdocs.org/files/sha256/83/78/8378ee5079fe7495fe18c658e16828cc61fd8d3cac2ad1e94e42895b559f0b10
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/233196F4696443BD8625803C0072DC33.0001
- DRS record last changed: September 30, 2016
- Page: https://openairdocs.org/saib/HQ-16-25

## Text

Some pages are OCR from the scanned FAA bulletin. OCR can misread letters and numbers.

FAA Aviation Safety

**SPECIAL AIRWORTHINESS**

INFORMATION BULLETIN SUBJ: SBAS-capable FMS and GPS Equipment With No LP capability SAIB: HQ-16-25 Date: September 28, 2016 This is information only. Recommendations aren’t mandatory.

Introduction

This Special Airworthiness Information Bulletin (SAIB) is for navigation equipment manufacturers of space-based augmentation system (SBAS) capable navigation equipment that does not include localizer performance without vertical guidance (LP) capability and their database providers. This SAIB addresses navigation equipment (primarily flight management systems (FMS)) providing LP instrument approach procedures (IAP) to pilots when the navigation equipment is not certified for LP approach capability.

At this time, the airworthiness concern is not an unsafe condition warranting an airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

Background

LP is a line of minima on area navigation (global positioning system) (RNAV(GPS)) IAPs charted as either stand-alone or in combination with lateral navigation (LNAV) and/or Circling minimums.

RTCA/DO-229D Chg 1 implemented by TSO-C145() and C146() requires operational Class 3 and Class 4 equipment to provide LP capability. Some manufacturers received deviations to not provide LP capability. The deviations were granted with an equipment limitation that, when installed, it is not approved for LP IAPs, but the equipment is approved to fly an LNAV line of minima. This means the equipment must not allow pilots to select an LP line of minima since the equipment is not approved for that capability.

Additionally, IAPs with only LP and Circling minimums (see figure 1) require the installed equipment and aircraft to be approved for LP capability to accomplish the Circling minimums. Some manufacturers, database providers, and aircraft operators incorrectly believe the circling minimums are based on LNAV capability rather than LP.

IAPs with LP, LNAV, and Circling minimums (see figure 2) only require LNAV capability to accomplish the Circling minimums.

AL-6920 (FAA) 16119 AL-765 (FAA) 1.5064 WAAS APP CRS Ro2 g RNAV (GPS) Z RWY 9 WAA RNAV (GPS) Y RWY 21 CH 82637 WO9B TELLURIDE RGNL (TEX) W21A 640 CHARLOTTESVILLE-ALBEMARLE (CHO) DA ATIS POTOMAC APP CON CHARLOTTESVILLE TOWER* GND CON UNICOM DENVER CENTER 118.425 132.85 323.125 124.5 (CTAF) @ 338.275 121.9 338.275 122.95 12000 34100 123.0 (CTAF) C DEYLK: (10347 SA ORMEY 25 M „2864 Procedure NA for Limit Missed Approoch TO 100 RAS NE-3, 15 SEP 2016 to 13 OCT 2018 2471 * 11034 Final approach course offret 14.5°.

CEPMA 0960-2531 Agges 1.580 • 9325 10595 A,3374 7ố2 ‹ ELEV 9070 D TOZE 9038 ELEV 640D TOZE 626 AL1785 " 4 NM 1100 4000 GVI Hang tran Holding Pattem 8 NM VOR DM A 670+ ECEUS 044°- 4300 13000- → 209°

•102° 196°-**2400 3400 12900 CATEGORY 1 SEND 133 N C CIRCUNG 2570 (2600-1½) 2570 (2600-1½) 2570 (2600-3) LP MDA* 10640-14 602(1600-1⅞) 1602(1600-11½) 1602(1600-3) 10640-3 NA REIL Ruys 9 and 27 0 HIRL Ruy 9-27 0 COUNS LHAY MDA 1080-1 454(500-1) 1100-1 940-1 314(1080 19 454(500-1 %) 1100-13 040 1900-2% 1480-2

TELLURIDE RGNL (TEX) RGINIA CHARLOTTESVILLE-ALBEMARLE (CITO) 37°57°N-107*55 W RNAV (GPS) Z RWY 9 38081-7827 W RNAV (GPS) Y RWY 21 Figure 1 Figure 2 Recommendations Manufacturers of SBAS operational Class 3 and Class 4 navigation equipment without LP capability must ensure pilots cannot select an LP IAP line of minima. The equipment manufacturer may use hardware or software methods, or database controls (i.e., removing LP from the navigation database) to prevent pilots from accessing LP minimums, LP-only IAPs, or IAPs with only LP and Circling minimums.

Equipment manufacturers affected by this SAIB must also ensure their equipment operating manuals clearly explain the equipment does not provide LP capability and the level of service (LNAV, LNAV/VNAV, LPV) annunciations for RNAV(GPS) IAPs.

For Further Information Contact Kevin J. Bridges, General Engineer, Systems and Equipment Standards Branch; 470 L'Enfant Plaza, Suite 4102, Washington DC, 20024; phone: (202) 267-8526; fax: (202) 267-8589; e-mail:

kevin.bridges@faa.gov.

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