A captain and first officer report about an unusual vibration during climb on their B777-200 aircraf...

Attributes
ACN	1032314
Time
Date	201208
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZZ.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Flap Fairing
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural MEL Inflight Event / Encounter Fuel Issue

Narrative:

During climb; we noticed an unusual vibration in the aircraft. This aircraft had a cdl placard on it for the the removal of the right inboard flap fairing. I believed that the possible source of this vibration was this cdl item. During cruise flight we began to notice an increase in our fuel burn compared to the flight plan. After two hours in flight we were down by 1;000 pounds. After four hours we were down by 3;000 pounds; after six hours we were down by 4;000 pounds. We contacted dispatch and also contacted our engine shop technicians to determine the possible extra fuel burn. Since the fuel burn was going to burn into my required reserve and alternate fuel required for landing at ZZZZ; I decided to divert into ZZZZ1. We landed at ZZZZ1 and refueled and than continued on to ZZZZ.

Original NASA ASRS Text

Title: A Captain and First Officer report about an unusual vibration during climb on their B777-200 aircraft after a CDL was applied for removal of the right inboard flap fairing. Crew diverted due to excessive fuel burn; which would have affected required fuel reserve and alternate fuel.

Narrative: During climb; we noticed an unusual vibration in the aircraft. This aircraft had a CDL placard on it for the the removal of the right inboard flap fairing. I believed that the possible source of this vibration was this CDL item. During cruise flight we began to notice an increase in our fuel burn compared to the flight plan. After two hours in flight we were down by 1;000 LBS. After four hours we were down by 3;000 LBS; after six hours we were down by 4;000 LBS. We contacted Dispatch and also contacted our Engine Shop Technicians to determine the possible extra fuel burn. Since the fuel burn was going to burn into my required reserve and alternate fuel required for landing at ZZZZ; I decided to divert into ZZZZ1. We landed at ZZZZ1 and refueled and than continued on to ZZZZ.

Data retrieved from NASA's ASRS site as of July 2013 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 captain and first officer report about an unusual vibration during climb on their B777-200 aircraft after a cdl was applied for removal of the right inboard flap fairing. Crew diverted due to excessive fuel burn; which would have affected required fuel reserve and alternate fuel.