The Air Force is taking more heat over the oxygen problems on-board the F-22 Raptor.
Senator Mark Warner and former Air Force pilot and current Congressman Adam Kinzinger sent a letter to Air Force Secretary Michael Donley Tuesday demanding answers to a number of questions about the raptor.
F-22 Raptor Probe
* Did USAF Under-report Oxygen Incidents
* USAF's Testing and Diagnostic Steps
* Latest Pressure Vest Testing Information
* Did USAF Bid-out Back-up Oxygen System
They want to know is the Air Force under-reporting incidents of Raptor pilots experiencing hypoxia-type symptoms during flight.
They also want to know what tests the Air Force performed before and after the oxygen problems first surfaced in late 2010.
They want to know the latest on the pilot pressure vest, which has been identified as a possible source of the oxygen problems.
And they want to know if the Air Force put-out bids for a 19-million dollar back-up oxygen back system before awarding the contract last month to Raptor manufacturer Lockheed-Martin.
Warner and Kinzinger say they want a response within 30-days. The letter comes on the heels of another Raptor incident.
On July 6th an F-22 pilot declared an in-flight emergency after reporting hypoxia-like symptoms during a flight at Hickam Field, Hawaii.
Warner and Kinzingr cited a restricted airflow incident at Langley Air Force Base Virginia in late June, and the May 31st incident at Tyndall Air Force Base, where a Raptor pilot hit the runway without extending his land gear.
Tyndall is the training home for all Raptor pilots, and is scheduled to get an operational squadron of F-22's next year.