Second hand information, not personally involved.
Suppose that you feel a "bump" in flight. One "bang", judder of the airframe, no loss of power or lift, engine running fine afterwards and no sign of vibration or loss of control.
Would you auto, MAYDAY and power-on land in a public park in a large city?
East London Advertiser - Helicopter makes emergency landing in Millwall Park
YES is the right answer.
If you get the same symptoms then have an engineer check the sprag clutch! Aircraft in bits. Part going back to Robinson. AAIB / CAA informed.
Helicopter makes emergency landing in Millwall Park
10 March 2010
RESIDENTS basking in the sunshine in Millwall Park had to make a quick escape on Sunday afternoon when a helicopter was forced to make an emergency landing.
The pilot of the four-seater helicopter had to make the landing in the park on the Isle of Dog following mechanical problems with the aircraft.
Firefighters from Millwall Station were called to clear the park and help guide the pilot to safety at around 5.30pm.
Crew manager David Maisey told the Advertiser that a couple from Redhill in Surrey had been enjoying a tour of the skies 1,500ft above the ground, over Canary Wharf, to celebrate their tenth wedding anniversary.
Mr Maisey said: "The pilot said there was a loud bang and then the helicopter started to drop.
"But he managed to land it safely and we had to check that everyone was alright. "There were kids playing football but they were enthralled by what was happening.
"The helicopter had to eventually be towed away.