COZY: broken airflow elbow
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Bill Allen
In the UK, where there is no “Experimental” category available to individual builders (there is, if you are, for example Rolls Royce - but thats another story…) our CAA (UK FAA) delegates approval for homebuilts to the Light Aircraft Association (LAA) who have responsibility for issuing “Permits to Fly”. The LAA have a network of inspectors and procedures for approving “modifications” and when I fitted my AFP unit back in 2000, an inspector came to inspect the installation. He saw the AFP unit cantilevered off the sump and would not approve the installation without additional support, on the grounds that this vibrating cantilevered mass could fatigue the 90deg adapter, causing “stress relieving fissures” (cracks) resulting in engine failure. I argued against this as “gold plating” of requirements, and adding unnecessary weight and complexity etc but he was firm that he wouldn’t sign it off without additional bracing - you can see the 2 white tubes from the brace that was eventually fitted between the sump and the AFP unit in the attached pics. Maybe my in the light of Marcs’ experience, the Inspector wasn’t so wrong…… having said that, my installation has done 500hrs in 20yrs versus Marcs’ 1100hrs, so without bracing maybe it would have lasted another 20 years….. Best to all, Bill Allen 
On Wed, 17 Aug 2022 at 17:53, vance atkinson <nostromo56@...> wrote:
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Ryszard Zadow
< Maybe my in the light of Marcs’ experience, the Inspector wasn’t so wrong…> Ya think? Most Bendix type throttle body’s, especially on Lycoming, are bolted to something incredibly solid like an oil sump. The attached pic is how we hung the throttle body on the Viggens cold air induction. I’d be leery of anything that heavy being stuck out on an arm and allowed to shake.  
On Aug 18, 2022, at 03:23, Bill Allen <billallensworld@...> wrote:
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