EFTA01183165

From: Larry Visoski To: Je vacation <jeevacation®gmail.com> Subject: Update Date: Sat, 30 Apr 2016 18:05:10 +0000 Inline-Images: IMG_5534.JPG; IMG_5537.JPG; IMG_5538.JPG; IMG_5539.JPG; IMG_5540.JPG Jeffrey We are addressing airflow into Fan Air Modulation valve„ We are installing new Servo Air Filter in diagram below, We removed both side Servo air filters and discovered reduced airflow in L/H side filter using Nitrogen air thru these filters, We want to make sure since this system has 40psi manifold pressure input and reduced to 9psi max for use in Fan Air modulation valve operation, so small reduction is supply air could effect Fan air Modulation operation? We assume. Sent from my iPhone EFTA01183165 rfight§slietY TRAINING 41/110m Sy MAINTENANCE o PRECOOLEI jC TO ISOLATION TEMP SHUTOFF VALVE CONTROL BOX SERVO AIR PRESSURE 45.30 REGULATOR AND TORQUE MOTOR ASSEMBLE svENT ESS VENT RELIEF VALVE DC ENSOR REGULATING SPRING DIAPHRAGMS TORQUE MOTOR ANTIC RAMA DAIR FOLD BLEED-ON METERING FLAPPER SERVO AIR VALVE FILTER HAMBE I RA WORT FINDER) FILTER --CHAMBER B CONTROL CYCLONE ORIFICE SEPARATOP SECTION CONE SECTION RELIEF VALVE COLLECTION CHAMBER FAN AIR AFT TAIL MODULATION VALVE COMPARTMENT FUSELAGE SKIN OLN BLEED TEMP>400, F BLEED-AIR PRESSURE LEGEND PEG AND SOV El REGULATED PRESSURE I Figure 36-13. Precooler and Servo Air System—Modulation Valve Open 36-26 FOR TRAINING PURPOSES ONLY arose& EFTA01183166 FlightSafety TRAINING MANUAL PRECOOLER OUTLET TEMPERATURE CONTROLLE PRECOOLER TEMPERATURE R CONTROL ANTICIPATOR Description SENSOR The control lei is a solid•stitte integr cuit amplifier that receives signals ated cir- Description temperature sensor and from the them into a single anticip ator and converts The precooler temperature control anticipator voltage signal for the oper- sensor is a dual sensing element that is in- ation of the torque motor, which in turn oper- stalled in the bleed -air manifold just down- ates the precooler fan air stream of the precooler. controller and torque modulating valve. The motor are mounted in the tail compartment The anticipator consists of two thermistor (Figure 36.12). I (nega tive coefficient) bead sensing eleme nts Operation mounted in a probe housing. The resistance of each element varies inversely with any change The control operates on a DC in ambient temperature (Table 36-2). One error signal pro- portional to the temperature signa sensing clement is thermally impeded by being ls. The sen- sor and anticipator arc part of a bridge enclosed in an insulated shield assembly. The circuit which supplies an error voltage analog housing is externally threaded for boss-mount- of tem- perature. When the controller receives a ing in an air duct and includes an electrical con- sig- nal from the temperature sensor that the nector to facilitate connection to the bleed-air temperature is less than 400:10°F temperature control system. 51 the controller sends a voltage signal up to 14 VDC to the torque motor 'via a 45.3 W load re- Operation sistor which reduces the voltage to 10 VDC maximum. This signal will cause the torque The thermally impended sensing element and motor to supply air pressure to close the fan the associated thermally open sensing ele- air modulation valve in order to reduce the ment of the anticipator form two arms of a cooling effect of the precooler. rate-of-change bridge circuit in the tempera- ture control system. The response of the ther- Bleed-air temperature above 400:10°F sensed mally impended element to changing by the temperature sensor will cause the con- temperature lags the response of the thermally troller to reduce the output voltage to the open element, and a signal is produced by the torque motor which will cause the fan air mod- bridge circuit proportional to the rate of change 5; ulating valve to open there by increasing the in temperature. cooling effect of the precooler. No adjustment No adjustment or maintenance is required. or maintenance is required. Bench -check pro- Bench-check procedures are found in Main- cedures are found in Maintenance Manual tenance Manual Chapter/Section 36.10-0. Chapter/Section 36-8-0. ig PRECOOLER OUTLET TEMPERATURE SENSOR Description 71 The precooler outlet temperature sensor is a temperature-sensitive thermistor (negative co- efficient element) installed in the bleed-air manifold, just downstream of the precooler. It is physically located in the tail compartment (Figure 36-12). I FOR TRAINING PURPOSES ONLY Revision 5 36-25 EFTA01183167 as Fi ki llt P•wasen• alifetY Figure 36-10. Precooler Heat Exchanger I 'LTER z RELIEF VALVE Figure 36.11. Precooler Fan Air Modulation Valve A FOR TRAINING PURPOSES ONLY EFTA01183168 FlightSLifetY PRE iOO1. t A MODULATION VALVE J ANTICIPATOR Figure 36-12. Precooler System Compon ents I Table 36-2. TEMPERATURE VS. RESISTA NCE CHE CK FOR TEMPERATURE SEN SOR 1250 NOTE 1200 When testing thennietats on bench the following should be notect 5 -1150 1 When measuring reeletance. enemy (Woe iC 1100 used all not slow sinter then BO micreempe to arm. Use of • Wheatstone ,i100 &Sage wen this limitation TR, the best method. G 1000 2. An accurate mango, determining lemoetature 950 'dawn to element eseentiel. 3. When checking 1n0000 of 900 be web allow lagged thertniatot lo stabiles lot 390 395 Nest 15 minutes belois 400 405 TEMPERATURE (`F) 410 mooting. 36-24 FOR TRAINING PURPOSES ONLY firtielon 5 EFTA01183169 EFTA01183170