JFABNRGR said:
74OA said:
JB!98 said:
Does TCAS not work in the approach or take off due to the proximity to so many other aircraft? Does it only read transponders, which I assume the Blackhawk did not have on?
NVM I type too slow. Saw the question above.
TCAS
I thought in the NTSB interview they stated the CRJ did receive a TCAS alert below 500'.
I could be wrong too much other stuff happening right now.
You may be conflating two things.
TCAS has two parts, Traffic Alerts (TA), and Resolution Advisories (RA)
TA's will occur further out and are supposed to draw attention to the conflicting traffic so we will locate them. Blonco said these are inhibited around 500' AGL (Above Ground Level) but the crew in the RJ did get one.
RA's are inhibited around 1000' AGL so we don't follow one into the ground on approach. The RA's are only vertical guidance by design. They were never going to get an RA.
In the landing environment, with a relatively short runway for the jet, and the UH60 being told to avoid the jet, they may have let their guard down a little and definitely had a bad angle to spot the chopper under the best of conditions because of the low turn they were in.
I suspect at least two things will come out of this; first, TA's under 1000' feet may result in airliner go arounds, especially at DCA. IIRC within the last few weeks a few had done so in this scenario.
Second, helos will be required to hold north of that bridge until the jets have crossed their path, and likely landed.
Aviation safety is written in blood unfortunately, and this is likely to be no exception.