A B727 captain and first officer submitted reports describing their departure on the jfk 7 which is based on an NDB rather than on a VOR. They reported that NDB's are not sensitive enough to make a smooth transition.

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Attributes
ACN	452801
Time
Date	199910
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : n90.tracon
State Reference	NY
Altitude	msl bound lower : 2500 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : kennedy 7
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 172 flight time type : 6844
ASRS Report	452801
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 10300 flight time type : 6000
ASRS Report	452800
Events
Anomaly	airspace violation : entry non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Airspace Structure Navigational Facility Flight Crew Human Performance Chart Or Publication
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Chart	sid : kennedy 7

Narrative:

Departed jfk runway 31L for jfk 7 departure, bridge climb. Captain making takeoff radio setup was as follows: captain had canarsie VOR, 039 degree radial set in HSI. ADF tuned to bridge, 414. Copilot had jfk VOR, 253 degree radial set. SID called for a left turn as soon as possible direct to bridge, cross jfk 253 degree radial at or above 2500 ft and do not fly west of canarsie 039 degree radial. Prior to takeoff, I noticed VOR/ADF bearing needle fluctuating in ADF mode. Copilot checked identify and it was good. Took off and started left turn direct to ADF. ADF bearing appeared to be taking us right of where we thought ADF was located. At the time, the captain could not monitor canarsie bearing because bearing needle was in ADF mode. Started to inform ATC, but they gave us a left turn to intercept jfk 156 degree radial. While turning, noticed canarsie 039 degree radial starting to move on HSI. Flew slightly west of radial. I do not think that this SID should be based on the bridge NDB. NDB's are not as reliable as VOR's. In this case, with all the navaids that we had to monitor at the same time, there was very little time to straighten out the problem. Had we flown the breezy point climb of the jfk 7 using only the canarsie VOR, we would have had a more reliable NAVAID and there would have been no problem.

Original NASA ASRS Text

Title: A B727 CAPT AND FO SUBMITTED RPTS DESCRIBING THEIR DEP ON THE JFK 7 WHICH IS BASED ON AN NDB RATHER THAN ON A VOR. THEY RPTED THAT NDB'S ARE NOT SENSITIVE ENOUGH TO MAKE A SMOOTH TRANSITION.

Narrative: DEPARTED JFK RWY 31L FOR JFK 7 DEP, BRIDGE CLB. CAPT MAKING TKOF RADIO SETUP WAS AS FOLLOWS: CAPT HAD CANARSIE VOR, 039 DEG RADIAL SET IN HSI. ADF TUNED TO BRIDGE, 414. COPLT HAD JFK VOR, 253 DEG RADIAL SET. SID CALLED FOR A L TURN ASAP DIRECT TO BRIDGE, CROSS JFK 253 DEG RADIAL AT OR ABOVE 2500 FT AND DO NOT FLY W OF CANARSIE 039 DEG RADIAL. PRIOR TO TKOF, I NOTICED VOR/ADF BEARING NEEDLE FLUCTUATING IN ADF MODE. COPLT CHKED IDENT AND IT WAS GOOD. TOOK OFF AND STARTED L TURN DIRECT TO ADF. ADF BEARING APPEARED TO BE TAKING US RIGHT OF WHERE WE THOUGHT ADF WAS LOCATED. AT THE TIME, THE CAPT COULD NOT MONITOR CANARSIE BEARING BECAUSE BEARING NEEDLE WAS IN ADF MODE. STARTED TO INFORM ATC, BUT THEY GAVE US A L TURN TO INTERCEPT JFK 156 DEG RADIAL. WHILE TURNING, NOTICED CANARSIE 039 DEG RADIAL STARTING TO MOVE ON HSI. FLEW SLIGHTLY W OF RADIAL. I DO NOT THINK THAT THIS SID SHOULD BE BASED ON THE BRIDGE NDB. NDB'S ARE NOT AS RELIABLE AS VOR'S. IN THIS CASE, WITH ALL THE NAVAIDS THAT WE HAD TO MONITOR AT THE SAME TIME, THERE WAS VERY LITTLE TIME TO STRAIGHTEN OUT THE PROB. HAD WE FLOWN THE BREEZY POINT CLB OF THE JFK 7 USING ONLY THE CANARSIE VOR, WE WOULD HAVE HAD A MORE RELIABLE NAVAID AND THERE WOULD HAVE BEEN NO PROB.

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.