Narrative:

Without intent to violate the airspace rules I entered class a airspace while on an IFR filed maintenance flight.as filed via internet; departed home base in a turbine legend; contacted approach as I was climbing out and they could not locate my flight plan and passed me to center. I was unable to reach center but continued to try as I climbed to FL175 and held for some time while trying to contact center on various frequencies including approach. After sometime at FL175; I climbed to FL250 believing I should follow my 'as filed' route and profile. Was finally able to contact approach and explain my situation. They asked me to take a northerly heading and descend to FL130 then recommended I land; fix the comm and check my oxygen system as he felt I was exhibiting hypoxia. I realized I was experiencing hypoxia.factor I consider contributed to this situation:1. Aircraft is relatively new to me.2. New oxygen masks with internal mic.3. Communications equipment problems.4. Inadvertently transposed [digits in] north number on filed flight plan.factor notes:1. Only 40 hours in type and performance level.2. May not have properly adjusted the mask to ensure proper O2 was being delivered and a flawed built in mic may have led to some of the comm issues.3. Aircraft is equipped with dated avionics that I plan to replace with an entirely new panel this winter.4. Center did locate the transposed flight plan and linked it to me.

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Original NASA ASRS Text

Title: Pilot of a single engine turbine powered aircraft reported climbing into Class A airspace without being able to pick up a filed IFR clearance before hand due to communications problems. Once communication was established the Controller issued a heading and a clearance to 13;000 FT and suggested that the reporter was exhibiting symptoms of hypoxia and should land. The reporter agreed and proceeded to land.

Narrative: Without intent to violate the airspace rules I entered Class A airspace while on an IFR filed maintenance flight.As filed via internet; departed home base in a Turbine Legend; contacted Approach as I was climbing out and they could not locate my flight plan and passed me to Center. I was unable to reach Center but continued to try as I climbed to FL175 and held for some time while trying to contact Center on various frequencies including Approach. After sometime at FL175; I climbed to FL250 believing I should follow my 'as filed' route and profile. Was finally able to contact Approach and explain my situation. They asked me to take a northerly heading and descend to FL130 then recommended I land; fix the comm and check my Oxygen System as he felt I was exhibiting hypoxia. I realized I was experiencing hypoxia.Factor I consider contributed to this situation:1. Aircraft is relatively new to me.2. New oxygen masks with internal mic.3. Communications equipment problems.4. Inadvertently transposed [digits in] N number on filed flight plan.Factor Notes:1. Only 40 hours in type and performance level.2. May not have properly adjusted the mask to ensure proper O2 was being delivered and a flawed built in mic may have led to some of the comm issues.3. Aircraft is equipped with dated avionics that I plan to replace with an entirely new panel this winter.4. Center did locate the transposed flight plan and linked it to me.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.