Mechanic fails to place signature in logbook. PIC departure with aircraft, not noticing omission.

Attributes
ACN	300500
Time
Date	199504
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : san
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : takeoff ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 11000
ASRS Report	300500
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : far non adherence other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Maintenance completed repairs on oxygen bottle (crew) writeup. We were running 1/2 late. I watched mechanic do the job and then take the logbook. When he brought it back I glanced at the book and saw he had written the job as completed, however, I failed to notice that he had failed to sign the bottom of the page. We discovered this in pdx. So we had flown an open maintenance writeup. Although the work was completed. I believe we were technically illegal.

Original NASA ASRS Text

Title: MECH FAILS TO PLACE SIGNATURE IN LOGBOOK. PIC DEP WITH ACFT, NOT NOTICING OMISSION.

Narrative: MAINT COMPLETED REPAIRS ON OXYGEN BOTTLE (CREW) WRITEUP. WE WERE RUNNING 1/2 LATE. I WATCHED MECH DO THE JOB AND THEN TAKE THE LOGBOOK. WHEN HE BROUGHT IT BACK I GLANCED AT THE BOOK AND SAW HE HAD WRITTEN THE JOB AS COMPLETED, HOWEVER, I FAILED TO NOTICE THAT HE HAD FAILED TO SIGN THE BOTTOM OF THE PAGE. WE DISCOVERED THIS IN PDX. SO WE HAD FLOWN AN OPEN MAINT WRITEUP. ALTHOUGH THE WORK WAS COMPLETED. I BELIEVE WE WERE TECHNICALLY ILLEGAL.

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.