Communication pilot commented on proposed airworthiness directive.

Attributes
ACN	216460
Time
Date	199207
Day	Mon
Place
Locale Reference	airport : ska
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 10 flight time total : 2700 flight time type : 2500
ASRS Report	216460
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	faa : investigated
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

This comment regards the notice of proposed rule making for the airworthiness directive on the 2-PIECE venturi on old (manufacturer's model) type carbs as used in the small aircraft aircraft. My small aircraft aircraft was found to have a damaged primary venturi in the carburetor during its annual inspection in aug/84. The mechanic believed heat damage from a backfire was the cause. Therefore, I believe that higher-melting-point materials should be used for the primary venturi in the manufacturer's model carburetor. This venturi is small, fragile, and exposed to backfires. Simply changing the 2- piece construction to a 1-PIECE venturi may be inadequate. Damage may not only be mechanical, but may also be due to thermal shock. Callback conversation with reporter revealed the following: a callback was made to the reporter to advise him to make his comments to that address shown in the proposed 'airworthiness directive' and he replied that he had already done so and in addition discussed the matter by telephone to the person responsible for comment collection. He further stated that he had submitted other ASRS reports in the past and was favorably impressed with the ASRS work and wanted us to know that we did a good job.

Original NASA ASRS Text

Title: COM PLT COMMENTED ON PROPOSED AIRWORTHINESS DIRECTIVE.

Narrative: THIS COMMENT REGARDS THE NOTICE OF PROPOSED RULE MAKING FOR THE AIRWORTHINESS DIRECTIVE ON THE 2-PIECE VENTURI ON OLD (MANUFACTURER'S MODEL) TYPE CARBS AS USED IN THE SMA ACFT. MY SMA ACFT WAS FOUND TO HAVE A DAMAGED PRIMARY VENTURI IN THE CARB DURING ITS ANNUAL INSPECTION IN AUG/84. THE MECH BELIEVED HEAT DAMAGE FROM A BACKFIRE WAS THE CAUSE. THEREFORE, I BELIEVE THAT HIGHER-MELTING-POINT MATERIALS SHOULD BE USED FOR THE PRIMARY VENTURI IN THE MANUFACTURER'S MODEL CARB. THIS VENTURI IS SMALL, FRAGILE, AND EXPOSED TO BACKFIRES. SIMPLY CHANGING THE 2- PIECE CONSTRUCTION TO A 1-PIECE VENTURI MAY BE INADEQUATE. DAMAGE MAY NOT ONLY BE MECHANICAL, BUT MAY ALSO BE DUE TO THERMAL SHOCK. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: A CALLBACK WAS MADE TO THE RPTR TO ADVISE HIM TO MAKE HIS COMMENTS TO THAT ADDRESS SHOWN IN THE PROPOSED 'AIRWORTHINESS DIRECTIVE' AND HE REPLIED THAT HE HAD ALREADY DONE SO AND IN ADDITION DISCUSSED THE MATTER BY TELEPHONE TO THE PERSON RESPONSIBLE FOR COMMENT COLLECTION. HE FURTHER STATED THAT HE HAD SUBMITTED OTHER ASRS RPTS IN THE PAST AND WAS FAVORABLY IMPRESSED WITH THE ASRS WORK AND WANTED US TO KNOW THAT WE DID A GOOD JOB.

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.