nanog mailing list archives
Re: FW: Analysis from a JHU CS Prof
From: "Majdi S. Abbas" <msa () samurai sfo dead-dog com>
Date: Thu, 13 Sep 2001 15:06:53 -0700
On Thu, Sep 13, 2001 at 03:31:37PM -0500, Borger, Ben wrote:
Somehow the people who did this managed to turn off the transponders on these planes. Normally a plane flying in controlled airspace squawks a unique id and altitude which is decoded by their radar and associated with each blip. Sometimes low cost homebuilts/ultralights fly with no transponder, but Boeings <sarcasm>usually</sarcasm> do. If you set a transponder to 7500, it means you're being hijacked.
Some obvious things to do: 1) Turn off altitude reporting -- most of the transponders I've used have 3 settings (off, on, and on with altitude reporting) 2) Then sqwak VFR. 3) Turn the transponder off 4) Pull the breaker. (All flight avionics are on resettable breakers, accessible to the flight crew. There is good reason for this.) I wouldn't find it exactly surprising that any of the transponders had been switched off. It only takes a moment. --msa
Current thread:
- Re: Analysis from a JHU CS Prof, (continued)
- Re: Analysis from a JHU CS Prof Joel Baker (Sep 13)
- RE: Analysis from a JHU CS Prof Borchers, Mark (Sep 13)
- FW: Analysis from a JHU CS Prof Borger, Ben (Sep 13)
- RE: Analysis from a JHU CS Prof Leigh Anne Chisholm (Sep 13)
- Re: Analysis from a JHU CS Prof Jeff Mcadams (Sep 13)
- RE: Analysis from a JHU CS Prof Deepak Jain (Sep 13)
- Re: Analysis from a JHU CS Prof Joel Baker (Sep 13)
- RE: Analysis from a JHU CS Prof Matt Levine (Sep 13)
- RE: Analysis from a JHU CS Prof John Fraizer (Sep 13)
- RE: Analysis from a JHU CS Prof Leigh Anne Chisholm (Sep 13)
- Re: Analysis from a JHU CS Prof Owen DeLong (Sep 13)
- Re: FW: Analysis from a JHU CS Prof Majdi S. Abbas (Sep 13)
- RE: Analysis from a JHU CS Prof Matt Levine (Sep 13)
- RE: Analysis from a JHU CS Prof Mikael Abrahamsson (Sep 13)
- RE: Analysis from a JHU CS Prof Leigh Anne Chisholm (Sep 13)
- Re: Analysis from a JHU CS Prof Owen DeLong (Sep 13)