EMS operation flew helicopter beyond 25 hour inspection period.

Attributes
ACN	287976
Time
Date	199410
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Helicopter
Operating Under FAR Part	Part 135
Flight Phase	ground : preflight
Flight Plan	VFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 25 flight time total : 13000 flight time type : 400
ASRS Report	287976
Person 2
Affiliation	company : air taxi
Function	other personnel other
Qualification	other other : other
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

A review of aircraft records in the aim showed the aircraft was 4.9 hours away from the 25 hour inspection. I observed the mechanic doing the inspection and assumed he signed off the 25 hour. However, he was interrupted by phone calls and multiple tasks that made it impossible for him to get his job done. Our maintenance department was aware of several aircraft movements and did not return to complete an inspection during the day. I was not aware that the 25 hour was not complete until I was on my 11TH flight leg, 10 hours after I began flying. I was en route with patient on board when I was told that the mechanic was asking how much I had flown and how much time was left to the 25 hour. Cause: my assumption that the mechanic signed off inspection. Contributing: maintenance did not track and follow up.

Original NASA ASRS Text

Title: EMS OP FLEW HELI BEYOND 25 HR INSPECTION PERIOD.

Narrative: A REVIEW OF ACFT RECORDS IN THE AIM SHOWED THE ACFT WAS 4.9 HRS AWAY FROM THE 25 HR INSPECTION. I OBSERVED THE MECH DOING THE INSPECTION AND ASSUMED HE SIGNED OFF THE 25 HR. HOWEVER, HE WAS INTERRUPTED BY PHONE CALLS AND MULTIPLE TASKS THAT MADE IT IMPOSSIBLE FOR HIM TO GET HIS JOB DONE. OUR MAINT DEPT WAS AWARE OF SEVERAL ACFT MOVEMENTS AND DID NOT RETURN TO COMPLETE AN INSPECTION DURING THE DAY. I WAS NOT AWARE THAT THE 25 HR WAS NOT COMPLETE UNTIL I WAS ON MY 11TH FLT LEG, 10 HRS AFTER I BEGAN FLYING. I WAS ENRTE WITH PATIENT ON BOARD WHEN I WAS TOLD THAT THE MECH WAS ASKING HOW MUCH I HAD FLOWN AND HOW MUCH TIME WAS LEFT TO THE 25 HR. CAUSE: MY ASSUMPTION THAT THE MECH SIGNED OFF INSPECTION. CONTRIBUTING: MAINT DID NOT TRACK AND FOLLOW UP.

Data retrieved from NASA's ASRS site as of July 2007 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.