Noise abatement procedure requires operating DME for first turn. DME failed on takeoff.

Attributes
ACN	268025
Time
Date	199404
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	msl bound lower : 1000 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tower : sna
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff
Route In Use	departure : noise abatement
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 50 flight time total : 15000 flight time type : 2000
ASRS Report	268025
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

The noise abatement procedure at sna is at best marginally safe. The procedure requires a turn at the ILS 1 mi fix. There is no crossing radial for a back-up. The DME became intermittent after takeoff and we could not determine the point at which we should commence our turn. We may have set the noise monitor off because of the equipment failure. In my judgement, the noise abatement procedure should be standard for all airports. We should not be operating in airport environments with nonstandard noise restrs!

Original NASA ASRS Text

Title: NOISE ABATEMENT PROC REQUIRES OPERATING DME FOR FIRST TURN. DME FAILED ON TKOF.

Narrative: THE NOISE ABATEMENT PROC AT SNA IS AT BEST MARGINALLY SAFE. THE PROC REQUIRES A TURN AT THE ILS 1 MI FIX. THERE IS NO XING RADIAL FOR A BACK-UP. THE DME BECAME INTERMITTENT AFTER TKOF AND WE COULD NOT DETERMINE THE POINT AT WHICH WE SHOULD COMMENCE OUR TURN. WE MAY HAVE SET THE NOISE MONITOR OFF BECAUSE OF THE EQUIP FAILURE. IN MY JUDGEMENT, THE NOISE ABATEMENT PROC SHOULD BE STANDARD FOR ALL ARPTS. WE SHOULD NOT BE OPERATING IN ARPT ENVIRONMENTS WITH NONSTANDARD NOISE RESTRS!

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.