Air taxi flight crew reported being informed by their company after the event that they violated noi...

Attributes
ACN	1477226
Time
Date	201708
Local Time Of Day	0601-1200
Place
Locale Reference	OAK.Tower
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 135
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Published Material / Policy

Narrative:

We executed a standard RNAV arrival into oak. Had no altitude/speed deviations according to those published on the STAR. We then started receiving vectors and altitude assignments from ATC. Once we called the field in sight; and the traffic we were following in sight (a B737); we executed a visual approach in VMC conditions to runway 30. Three days later we were notified by our company that during our approach; we were a few hundred feet low according to noise abatement procedures. At the time of our supposed breach of procedure; we were on assigned altitudes from ATC; then on a visual approach; and at no time dangerously or unacceptably low. I'd be interested to know whether or not the ATC instructions we were following lead to non-compliance.make compulsory noise abatement procedures more easily accessible to the flight crew. We were completely unaware of the procedure we were apparently violating.

Original NASA ASRS Text

Title: Air taxi flight crew reported being informed by their company after the event that they violated noise standards during arrival to OAK. The crew was not aware of the procedures and was following published arrival procedures and ATC vectors until cleared for the visual approach.

Narrative: We executed a standard RNAV arrival into OAK. Had no altitude/speed deviations according to those published on the STAR. We then started receiving vectors and altitude assignments from ATC. Once we called the field in sight; and the traffic we were following in sight (a B737); we executed a visual approach in VMC conditions to runway 30. Three days later we were notified by our company that during our approach; we were a few hundred feet low according to noise abatement procedures. At the time of our supposed breach of procedure; we were on assigned altitudes from ATC; then on a visual approach; and at no time dangerously or unacceptably low. I'd be interested to know whether or not the ATC instructions we were following lead to non-compliance.Make compulsory noise abatement procedures more easily accessible to the flight crew. We were completely unaware of the procedure we were apparently violating.

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.

Air taxi flight crew reported being informed by their company after the event that they violated noise standards during arrival to oak. The crew was not aware of the procedures and was following published arrival procedures and ATC vectors until cleared for the visual approach.