A sight seeing balloon descended on top of a second sight seeing balloon. No damage to either.

Attributes
ACN	190728
Time
Date	199109
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ase
State Reference	CA
Altitude	agl bound lower : 300 agl bound upper : 300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : commercial
Experience	flight time last 90 days : 93 flight time total : 644 flight time type : 245
ASRS Report	190728
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial
Events
Anomaly	conflict : nmac non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 0 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

A hot air balloon flown by another commercial operator descended into my balloon. The pilot had been flying in close range of my balloon but had maintained 500-1000 ft clearance horizontally. It made a climb above me and caught a wind which centered it directly above me. The pilot then descended into my balloon to a depth of about 4-5 ft. The situation could have been avoided by respecting the right of way of the balloon below, also by observing slower rates of climb and descent. If pilot were trained to utilize level flight and slow climb and descent rates, instead of 'porpoising' as they fly. Also to become more observant of aircraft around them instead of becoming involved with talking to passenger it could have been avoided. No damage was done to either passenger or aircraft.

Original NASA ASRS Text

Title: A SIGHT SEEING BALLOON DSNDED ON TOP OF A SECOND SIGHT SEEING BALLOON. NO DAMAGE TO EITHER.

Narrative: A HOT AIR BALLOON FLOWN BY ANOTHER COMMERCIAL OPERATOR DSNDED INTO MY BALLOON. THE PLT HAD BEEN FLYING IN CLOSE RANGE OF MY BALLOON BUT HAD MAINTAINED 500-1000 FT CLRNC HORIZLY. IT MADE A CLB ABOVE ME AND CAUGHT A WIND WHICH CENTERED IT DIRECTLY ABOVE ME. THE PLT THEN DSNDED INTO MY BALLOON TO A DEPTH OF ABOUT 4-5 FT. THE SITUATION COULD HAVE BEEN AVOIDED BY RESPECTING THE RIGHT OF WAY OF THE BALLOON BELOW, ALSO BY OBSERVING SLOWER RATES OF CLB AND DSCNT. IF PLT WERE TRAINED TO UTILIZE LEVEL FLT AND SLOW CLB AND DSCNT RATES, INSTEAD OF 'PORPOISING' AS THEY FLY. ALSO TO BECOME MORE OBSERVANT OF ACFT AROUND THEM INSTEAD OF BECOMING INVOLVED WITH TALKING TO PAX IT COULD HAVE BEEN AVOIDED. NO DAMAGE WAS DONE TO EITHER PAX OR ACFT.

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.