A B-757 flight crew were urged by a mechanic not to report a hum and vibration noted near seats 6AB....

Attributes
ACN	1240416
Time
Date	201502
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Cargo Compartment Fire/Overheat Warning
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 28500 Flight Crew Type 6000
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

Narrative:

During preflight; two mechanics came to the cockpit. One mechanic asked me if we had written up the vibration felt in the floor at seat 6AB. I informed him that we were just informed by the flight attendant and had not had a chance to put it into ACARS. He then told me that they did not know what was causing the vibration and 'not to write it up and we could take the aircraft.' he said that if we write it up it would delay the departure and cause them to have to open up panels. I informed him that fars require us to write up discrepancies; I wanted it to be written up so that it would be documented and what they had done to identify and remedy the discrepancy recorded. Since we were about to go over the pacific; into ETOPS airspace; I felt it was prudent to identify the problem.this was a clear violation of far and totally unprofessional with no regard for aircraft safety. This is not a unique occurrence and becoming more of the norm in maintenance operations on a daily basis; as it turned out; it was an impending equipment failure in the fire/smoke detection system.

Original NASA ASRS Text

Title: A B-757 flight crew were urged by a Mechanic not to report a hum and vibration noted near seats 6AB. They reported it anyway. The vibration turned out to be an impending failure of a fan in the forward cargo compartment smoke detection system.

Narrative: During preflight; two mechanics came to the cockpit. One mechanic asked me if we had written up the vibration felt in the floor at seat 6AB. I informed him that we were just informed by the flight attendant and had not had a chance to put it into ACARS. He then told me that they did not know what was causing the vibration and 'not to write it up and we could take the aircraft.' He said that if we write it up it would delay the departure and cause them to have to open up panels. I informed him that FARs require us to write up discrepancies; I wanted it to be written up so that it would be documented and what they had done to identify and remedy the discrepancy recorded. Since we were about to go over the Pacific; into ETOPS airspace; I felt it was prudent to identify the problem.This was a clear violation of FAR and totally unprofessional with no regard for aircraft safety. This is not a unique occurrence and becoming more of the norm in maintenance operations on a daily basis; As it turned out; it was an impending equipment failure in the fire/smoke detection system.

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.

A B-757 flight crew were urged by a mechanic not to report a hum and vibration noted near seats 6AB. They reported it anyway. The vibration turned out to be an impending failure of a fan in the forward cargo compartment smoke detection system.