Late Flight Lt Achudev's father Sahadevan VP wrote the letter seeking the probe either by CBI or NIA or RAW or IB to "unfold the mystery and reveal the truth" behind the crash.
"As much as we are proud that he served the IAF away from us, he is my family's greatest asset. With his inconsolable mother awaiting Achudev's return, I sincerely request with the highest faith to initiate an all possible effort to trace my son at the earliest," he said in the letter sent through Attingal MP Dr A Sampath.
In a letter to Sampath on July 3, Sahadevan had said the IAF had sent a "symbolic coffin which did not contain any remains" of his son.
Among the articles recovered from the site of the mishap was only a burnt piece of his son's wallet, a shoe of the other pilot and a hand glove. Their remains have to be found, he said.
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So far police has not registered a case and held inquries, he said.
Achudev had gone missing on May 23 this year along with Squadron Leader Pankaj while on a regular flying duty at Tezpur Air Force station.
"We still believe that he is missing," he said.
Sahadevan has said he has "every privilege to know if my son is alive, where is he. If the IAF confirms otherwise, where is the remains of his body, which can rationally confirm this. Else, on what basis the air force has reached this conclusion?" he asked.
Sahadevan, a former scientist with ISRO, has also asked why no further search and rescue operations had taken place based on the FDR/CVR data findings which should have revealed further details of the incident.
He also wanted to know if there was any material evidence to conclude that both the pilots could not initiate ejection as stated by the ministry of defence and if ISRO's technology and the aid of foreign satellite imagery was utilised for search and rescue operations.
The plane's wreckage was detected on 26 May and the IAF had later declared the pilots dead. Achudev's funeral was held on June 3 at his ancestral home at Kozhikode.
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