Initial reports said the Pakistan International Airlines (PIA) jet, an Airbus A320, crashed after an apparent engine failure.
Pakistani aviation authorities said Tuesday they had shared their initial findings with the visiting 11-member team from the European plane maker.
The Airbus experts and engineers are also to visit the crash site, according to Abdul Hafeez, a spokesman for PIA. "We are providing all possible assistance to the technical experts of Airbus," he said.
Flight PK-8303 took off from the eastern city of Lahore and crashed on Friday while trying to land at the Karachi airport, Civil Aviation Authority spokesman Abdul Sattar Kokhar said.
On the ground, 18 homes were damaged but no one was killed, mainly because the local residents were gathered at nearby mosques at the time, officials said. Eight people were injured on the ground.
So far, Pakistan has handed over 41 bodies to their families, Hafeez said, adding that DNA tests were underway to identify the remains of the other victims. Only two people on board survived.
The plane made failed attempts to land at the Karachi airport before the crash.
Authorities found the plane's black box and have been guarding the crash site to facilitate the probe. The plane last received a government check last November.
PIA's chief engineer signed a separate certificate on April 28, confirming all maintenance had been conducted. Airbus has said the two-engine plane had logged 47,100 flight hours and 25,860 flights as of last Friday.