<< >> NASA ASRS Report 316417, September 1995

Lda evaluation.

Attributes
ACN	316417
Time
Date	199509
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : sfo
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	316417
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	other anomaly other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Over lucss, on going visual, with barely 5 mi visibility, I couldn't see the PAPI! Had to dial in ILS runway 28R. Runway 28R descent guidance until I acquired PAPI at approximately 3 mi. Presently, I prefer to fly the fmcs approach. This is because while I'm on 'map mode' and 'LNAV' flying, I can pre-tune the ILS runway 28R and use the GS as reference to determine if I'm high or low. The disadvantage of the lda runway 28R approach is that it lacks the glide path guidance.

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Original NASA ASRS Text

Title: LDA EVALUATION.

Narrative: OVER LUCSS, ON GOING VISUAL, WITH BARELY 5 MI VISIBILITY, I COULDN'T SEE THE PAPI! HAD TO DIAL IN ILS RWY 28R. RWY 28R DSCNT GUIDANCE UNTIL I ACQUIRED PAPI AT APPROX 3 MI. PRESENTLY, I PREFER TO FLY THE FMCS APCH. THIS IS BECAUSE WHILE I'M ON 'MAP MODE' AND 'LNAV' FLYING, I CAN PRE-TUNE THE ILS RWY 28R AND USE THE GS AS REF TO DETERMINE IF I'M HIGH OR LOW. THE DISADVANTAGE OF THE LDA RWY 28R APCH IS THAT IT LACKS THE GLIDE PATH GUIDANCE.

Data retrieved from NASA's ASRS site as of July 2007 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.