Exactly five years on from the Fox Glacier skydive plane crash that killed nine people, an addendum to the report into the tragedy is still to be released.

A draft addendum on the September 4, 2010 crash was released to the family members in May, and they were given a month to respond.

Deputy chief investigator of accidents Peter Williams said the Transport Accident Investigation Commission (TAIC) would reconsider the draft later this month, but it would not be ready before October and could take longer.

An interim report by the TAIC suggested that the modified top-dressing plane was slightly overloaded and off-balance.

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Soon after the crash and at the direction of the TAIC, parts of the plane, including the control stick, were buried in a paddock at the end of the Fox Glacier airstrip where it crashed in a fireball.

Four overseas backpackers and five Skydive NZ staff members were killed in the crash.

An independent review of the initial scene examination and wreckage handling will be released at the same time as the addendum.