<< >> NASA ASRS Report 1131225, November 2013

A corporate jet autoflight system failed to generate a glideslope on the hnd GPS-B approach; so the pilot selected V/south and descended 700 feet below the if to FAF segment minimum altitude where the GPWS terrain warning alerted at which point he executed a go-around.

Attributes
ACN	1131225
Time
Date	201311
Local Time Of Day	1201-1800
Place
Locale Reference	HND.Airport
State Reference	NV
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Light Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Other GPS-B
Flight Plan	IFR
Component
Aircraft Component	Navigational Equipment and Processing
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 3970 Flight Crew Type 1200
Events
Anomaly	Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT Inflight Event / Encounter Weather / Turbulence

Narrative:

Was vectored onto final approach course of the GPS-B into hnd airport. After the if I did not receive vertical gp down to the next restricted altitude so I commanded vertical speed (V/south) on the flight guidance panel to capture. Between the if (hakid) and the FAF (jexix) I read an incorrect minimum altitude from the vertical navigation vs. The minimum altitude for that segment of the approach descending almost 700 feet below the prescribed altitude for that segment before I caught my mistake. I received a ground proximity alert and initiated a missed approach. I then climbed to 7;000 feet MSL and received vectors for the second successful approach.

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Original NASA ASRS Text

Title: A corporate jet autoflight system failed to generate a glideslope on the HND GPS-B approach; so the pilot selected V/S and descended 700 feet below the IF to FAF segment minimum altitude where the GPWS TERRAIN warning alerted at which point he executed a go-around.

Narrative: Was vectored onto final approach course of the GPS-B into HND Airport. After the IF I did not receive vertical GP down to the next restricted altitude so I commanded vertical speed (V/S) on the flight guidance panel to capture. Between the IF (HAKID) and the FAF (JEXIX) I read an incorrect minimum altitude from the vertical navigation vs. the minimum altitude for that segment of the approach descending almost 700 feet below the prescribed altitude for that segment before I caught my mistake. I received a ground proximity alert and initiated a missed approach. I then climbed to 7;000 feet MSL and received vectors for the second successful approach.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.