Midair collision between Helicopter and CRJ (AA5342) at Washington (DCA)

(Assuming you meant visual separation not clearance
Thank you - edited.

What is the procedure for verifying (by ATC or by the pilots) that what they are seeing is what they are supposed to be seeing

If pilots can see a taxiway as a runway, i can imagine they can see something other than what they are supposed to see.
....

it’s a control zone under their control, not a pilot wish zone

Unless ATC wants the pilots to request visual separation at DCA?
What is the benefit to the pilot to request a visual separation and what is the benefit to the ATC to approve same?
Has DCA ATC ever refused "visual separation"?.
 
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Thank you - edited.

What is the procedure for verifying (by ATC or by the pilots) that what they are seeing is what they are supposed to be seeing

If pilots can see a taxiway as a runway, i can imagine they can see something other than what they are supposed to see.
....



Unless ATC wants the pilots to request visual separation at DCA?
What is the benefit to the pilot to request a visual separation and what is the benefit to the ATC to approve same?
Has DCA ATC ever refused "visual separation"?.
Visual separation helps with traffic flow put simply. At Bankstown which at times has been the busiest tower in the southern hemisphere it’s generally all visual, otherwise we would not get 1600 movements a day. Inbound traffic was given details of other inbound traffic but not details of departing or training circuit traffic. I would normally give an expected sequence number ie IEU, traffic is a MU2 reported at prospect before you joining downwind, expect to be no2 to that aircraft, report sighting.
 
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2 seconds before collision :
CRJ Last recorded RA 313 feet, 9 deg pitch up, 11deg left bank. Descending at 448ft/min

1 Second before collision
CRJ pitched up 9deg with elevators at max deflection

At the time of collision:
BH RA 278 feet stable for previous 5 seconds
Pitch 0.5deg nose up, left roll 1.6deg

BH primary altimeters are barometric altimeters whose data are not recorded in the FDR. Barometric pressure adjustment is also not recorded by the FDR
The pressure altitude data in the FDR is corrupted/bad so unable to be used to derive the barometric altitude.
GPS data including altitude is not recorded .

BH can transmit ADS-B out but it was not transmitting

BH CVR does not include ATC message to "pass behind CRJ " - apparently the transmission was stepped on

Please advise if incorrect
 
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