H25B crew had a low oil pressure light after maintenance did not replace the oil tank cap.

Attributes
ACN	609631
Time
Date	200402
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 30000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc tower : zzz.tower
Operator	general aviation : corporate
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 4400 flight time type : 250
ASRS Report	609631
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : oil pressure warning light other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : diverted to another airport flight crew : landed as precaution none taken : detected after the fact other
Consequence	other
Factors
Maintenance	performance deficiency : non compliance with legal requirements performance deficiency : inspection performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Climbing through FL300 the master warning lights went off and the left engine oil pressure annunciator illuminated. Checked gauge and it read 20 psi (25 psi red line) went through checklist and shut left engine down. Returned to airport and landed uneventfully. Took aircraft to maintenance facility and found they had left oil cap off. They replaced oil cap, filled with oil, ran engine, leak checked and signed off. We then continued the day with a flight to ZZZ1 and to ZZZ2 without incident.

Original NASA ASRS Text

Title: H25B CREW HAD A LOW OIL PRESSURE LIGHT AFTER MAINT DID NOT REPLACE THE OIL TANK CAP.

Narrative: CLBING THROUGH FL300 THE MASTER WARNING LIGHTS WENT OFF AND THE L ENG OIL PRESSURE ANNUNCIATOR ILLUMINATED. CHKED GAUGE AND IT READ 20 PSI (25 PSI RED LINE) WENT THROUGH CHKLIST AND SHUT L ENG DOWN. RETURNED TO ARPT AND LANDED UNEVENTFULLY. TOOK ACFT TO MAINT FACILITY AND FOUND THEY HAD LEFT OIL CAP OFF. THEY REPLACED OIL CAP, FILLED WITH OIL, RAN ENG, LEAK CHKED AND SIGNED OFF. WE THEN CONTINUED THE DAY WITH A FLT TO ZZZ1 AND TO ZZZ2 WITHOUT INCIDENT.

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.