X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 23 May 2009 13:58:27 -0400 Message-ID: X-Original-Return-Path: Received: from web81206.mail.mud.yahoo.com ([68.142.199.110] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with SMTP id 3651451 for lml@lancaironline.net; Sat, 23 May 2009 09:34:04 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.199.110; envelope-from=cwfmd@yahoo.com Received: (qmail 95898 invoked by uid 60001); 23 May 2009 13:33:29 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=0ofT/vr4F1tZH7c4lb5wzWoBf0phV83dmsBFkmUVNpu7wUTFiMzEgow7o/hI6116vzu6mX2exjWEh+o/eEuuL1e6zTSEE9TrBkRl/HFNcQzzXxKQXoSH1VdeJTCc6gs59mX3Wx0vO7pGRKeBhGVSZ+f32f0IkVTL/bgbONOnhpM=; X-Original-Message-ID: <244868.93611.qm@web81206.mail.mud.yahoo.com> X-YMail-OSG: zMumaJcVM1nNRpKtGSjIPil0DwokYhAQQ9BDZotwPd0kCrbNkL_YgbiFHMusBPPU8a.R3ZejUXg2dB5vIDm.PLTYIU9Gm6kPZqRg_vRZti1PR44BxDr_bJtZ1jBCibciVpnK73C7vshq26LM6cLRkzM4p_5vJF66Tw4vllcCF30uHuNOqttBtGfipaNAGVq_kc0.6ut.HfHbGqbspc_BM8N4FK.O1iOCCxxTe1zC_THr.vGPqyTdZL.hk0hwP8xl7n_qGB.BsJ02ZiaAXW8O4GEsPZqSTsI4LHaK Received: from [98.201.146.11] by web81206.mail.mud.yahoo.com via HTTP; Sat, 23 May 2009 06:33:29 PDT X-Mailer: YahooMailClassic/5.3.9 YahooMailWebService/0.7.289.10 X-Original-Date: Sat, 23 May 2009 06:33:29 -0700 (PDT) From: William Miller Subject: Re: FL220 [and high speed taxi] fuel flow interruption X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-667233352-1243085609=:93611" --0-667233352-1243085609=:93611 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable We sent off the fuel pump for inspection and overhaul. Due back late next w= eek. Still no causal chain isolated.... =A0Lancair inspected the photos and they believe we have 1/2" lines. Anybod= y know the best way to access to inspect these lines for both diameter and = number of 90 degree turns? =A0As I reviewed the data, it is difficult to determine whether MAP or FF f= ails first. It occurs to me that some intermittent failure of the turbochar= ger MAP feedback control might also cause this pattern, though far less lik= ely than FF. On the ground failures, the turbos were spooling up from idle.= At FL 220 they were at full power < critical altitude. =A0=A0 (anybody know their IV-P crit alt from flt test?) =A0Since vapor lock remains mysterious and we have all this on-board data m= onitoring capability, I wonder if there's a way to monitor for bubbles in t= he feedline to the low boost and to the engine driven pump. In monitoring p= ilots for the bends (space suit prebreathing was used this week on the Hubb= le Mission), at Brooks AFB, we could early detect micro-bubbles in the bloo= d with ultrasound before the symptoms were experienced by the "astronaut". = As the bubbles get bigger you start to see problems as big bubbles lodge in= important places like joints, heart, brain etc. Some kind of acoustic or o= ptical detector might give us early warning. =A0Has anyone seen a takeoff mishap attributed to vapor lock? Particularly = in the IV or TSIO-550B? Thanks Bill Miller --0-667233352-1243085609=:93611 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
We sent off the fuel pump for inspection and = overhaul. Due back late next week. Still no causal chain isolated....
&n= bsp;Lancair inspected the photos and they believe we have 1/2" lines. Anybo= dy know the best way to access to inspect these lines for both diameter and= number of 90 degree turns?
 As I reviewed the data, it is difficul= t to determine whether MAP or FF fails first. It occurs to me that some int= ermittent failure of the turbocharger MAP feedback control might also cause= this pattern, though far less likely than FF. On the ground failures, the = turbos were spooling up from idle. At FL 220 they were at full power < c= ritical altitude.
   (anybody know their IV-P crit alt from fl= t test?)
 Since vapor lock remains mysterious and we have all this = on-board data monitoring capability, I wonder if there's a way to monitor f= or bubbles in the feedline to the low boost and to the engine driven pump. In= monitoring pilots for the bends (space suit prebreathing was used this wee= k on the Hubble Mission), at Brooks AFB, we could early detect micro-bubble= s in the blood with ultrasound before the symptoms were experienced by the = "astronaut". As the bubbles get bigger you start to see problems as big bub= bles lodge in important places like joints, heart, brain etc. Some kind of = acoustic or optical detector might give us early warning.
 Has anyo= ne seen a takeoff mishap attributed to vapor lock? Particularly in the IV o= r TSIO-550B?
Thanks
Bill Miller
--0-667233352-1243085609=:93611--