A B777 first officer reports two types of tire and wheel assemblies for 'a' and one for 'B' models. Notation 'cf' on maintenance release when 'B' installed on 'a' model. Reporter finding 'B' wheels on 'a' model with no 'cf' on maintenance release.

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Attributes
ACN	709464
Time
Date	200604
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : relief pilot
Experience	flight time last 90 days : 230 flight time total : 18000 flight time type : 3000
ASRS Report	709464
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : work cards contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : installation
Supplementary
Problem Areas	Chart Or Publication Maintenance Human Performance Environmental Factor Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

The B777 has 2 types of wheel/tire assemblies; one for the a model and one for the B model. Although there are flight crew procedures when an 'a' wheel is on a 'B' plane; the only flight crew action when a 'B' wheel is on an 'a' plane is to check that there is a confign factor in the release document. It was noted on walkaround that the left truck; center; outboard wheel was a 'B' wheel; but it was an 'a' plane. Maintenance was notified; but misread the procedure and did not reissue the release document. The other pilots were unaware that a confign factor was required in the release document since there is no other flight crew actions required. This is the third plane in as many months that I have found with a 'B' wheel on an 'a' plane without the necessary confign factor in the release document. Although this was not a safety of flight issue; it was technically an illegal dispatch since we did not have a correct release document.

Original NASA ASRS Text

Title: A B777 FO RPTS TWO TYPES OF TIRE AND WHEEL ASSEMBLIES FOR 'A' AND ONE FOR 'B' MODELS. NOTATION 'CF' ON MAINT RELEASE WHEN 'B' INSTALLED ON 'A' MODEL. RPTR FINDING 'B' WHEELS ON 'A' MODEL WITH NO 'CF' ON MAINT RELEASE.

Narrative: THE B777 HAS 2 TYPES OF WHEEL/TIRE ASSEMBLIES; ONE FOR THE A MODEL AND ONE FOR THE B MODEL. ALTHOUGH THERE ARE FLT CREW PROCS WHEN AN 'A' WHEEL IS ON A 'B' PLANE; THE ONLY FLT CREW ACTION WHEN A 'B' WHEEL IS ON AN 'A' PLANE IS TO CHK THAT THERE IS A CONFIGN FACTOR IN THE RELEASE DOCUMENT. IT WAS NOTED ON WALKAROUND THAT THE L TRUCK; CTR; OUTBOARD WHEEL WAS A 'B' WHEEL; BUT IT WAS AN 'A' PLANE. MAINT WAS NOTIFIED; BUT MISREAD THE PROC AND DID NOT REISSUE THE RELEASE DOCUMENT. THE OTHER PLTS WERE UNAWARE THAT A CONFIGN FACTOR WAS REQUIRED IN THE RELEASE DOCUMENT SINCE THERE IS NO OTHER FLT CREW ACTIONS REQUIRED. THIS IS THE THIRD PLANE IN AS MANY MONTHS THAT I HAVE FOUND WITH A 'B' WHEEL ON AN 'A' PLANE WITHOUT THE NECESSARY CONFIGN FACTOR IN THE RELEASE DOCUMENT. ALTHOUGH THIS WAS NOT A SAFETY OF FLT ISSUE; IT WAS TECHNICALLY AN ILLEGAL DISPATCH SINCE WE DID NOT HAVE A CORRECT RELEASE DOCUMENT.

Data retrieved from NASA's ASRS site as of January 2009 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.