Date:	Friday 11 December 1970
Time:	evening
Type:	Piper PA-23-160 Apache
Owner/operator:	Private
Registration:	LN-LJO
MSN:	23-1827
Year of manufacture:	1959
Fatalities:	Fatalities: 3 / Occupants: 4
Other fatalities:	0
Aircraft damage:	Destroyed
Category:	Accident
Location:	Oslofjorden near Nordstrand -   Norway
Phase:	En route
Nature:	Private
Departure airport:	ENRY
Destination airport:	ENFB
Investigating agency:	Flyhavarikommisjon
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
Crashed into the sea in bad visibility near Nesodden in the Oslo fjord.
Pilot Leif Roger Danielsen (30) survived. Three passengers (22/22/38) died.

Cause of the accident
The probable cause of aircraft LN-LJO's accident in the sea near Nordstrand wharf on December 11, 1970 at 1603 hours was that in addition to several exhaust leaks, a fire occurred in the aircraft's heating system outside the combustion chamber. This led to an exhaust gas concentration in the cabin which is believed to have caused the occupants a certain degree of exhaust poisoning.Subsequently, the aircraft continued - partially uncontrolled - until it crashed into the sea.

Norwegian Civil Aircraft since 1919 / K. Hagby, 1980 (ISBN 0 904597 2 7)
Dagbladet 12...29 December 1970
https://havarikommisjonen.no/Luftfart/Luftfart/Avgitte-rapporter/1974-02?pid=SHT-Report-ReportFile&attach=1

Date/time	Contributor	Updates
25-Mar-2008 13:00	ASN archive	Added
18-Feb-2013 00:29	Masen63	Updated [Location, Country, ]
09-Sep-2017 18:17	TB	Updated [Time, Total fatalities, Total occupants, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Narrative, ]
09-Sep-2017 18:18	TB	Updated [Source, ]
20-Feb-2018 09:02	Harald	Updated [Operator, Departure airport, Destination airport, Narrative, ]
13-Feb-2024 14:21	whiteshark	Updated [Narrative, ]
13-Feb-2024 15:10	whiteshark	Updated
14-Jul-2025 06:17	HanayoPlus	Updated [Source, Narrative, ]
14-Jul-2025 06:20	ASN	Updated [Narrative, Accident report, ]