From: Larry Visoski

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 I Sy MAINTENANCE TRAINING TO ISOLATION SHUTOFF VALVE ENSOR ANTIC RAMA DAIR FOLD WORT FINDER) CYCLONE SEPARATOP SECTION CONE SECTION COLLECTION CHAMBER AFT TAIL COMPARTMENT FUSELAGE SKIN LEGEND El REGULATED PRESSURE 41/110 rfight§slietY m C BOX oj PRECOOLEI TEMP CONTROL SERVO AIR PRESSURE svENT 45.30 REGULATOR AND TORQUE MOTOR ASSEMBLE VENT RELIEF VALVE REGULATING SPRING DIAPHRAGMS SERVO AIR FILTER BLEED-ON METERING VALVE FILTER CONTROL ORIFICE RELIEF VALVE TORQUE MOTOR FLAPPER HAMBER I A --CHAMBER B FAN AIR MODULATION VALVE OLN BLEED TEMP>400, F BLEED-AIR PRESSURE PEG AND SOV Figure 36-13. Precooler and Servo Air System—Modulation Valve Open ESS DC 36-26 FOR TRAINING PURPOSES ONLY arose& EFTA01183166 FlightSafety TRAINING MANUAL PRECOOLER OUTLET TEMPERATURE CONTROLLER Description The control lei is a solid•stitte integrated cir- cuit amplifier that receives signals from the temperature sensor and anticipator and converts them into a single voltage signal for the oper- ation of the torque motor, which in turn oper- ates the precooler fan air modulating valve. The controller and torque motor are mounted in the tail compartment (Figure 36.12). Operation The control operates on a DC error signal pro- portional to the temperature signals. The sen- sor and anticipator arc part of a bridge circuit which supplies an error voltage analog of tem- perature. When the controller receives a sig- nal from the temperature sensor that the bleed-air temperature is less than 400:10°F the controller sends a voltage signal up to 14 VDC to the torque motor 'via a 45.3 W load re- sistor which reduces the voltage to 10 VDC maximum. This signal will cause the torque motor to supply air pressure to close the fan air modulation valve in order to reduce the cooling effect of the precooler. Bleed-air temperature above 400:10°F sensed by the temperature sensor will cause the con- troller to reduce the output voltage to the torque motor which will cause the fan air mod- ulating valve to open there by increasing the cooling effect of the precooler. No adjustment or maintenance is required. Bench-check pro- cedures are found in Maintenance Manual Chapter/Section 36-8-0. Revision 5 I PRECOOLER TEMPERATURE CONTROL ANTICIPATOR SENSOR Description The precooler temperature control anticipator sensor is a dual sensing element that is in- stalled in the bleed-air manifold just down- stream of the precooler. The anticipator consists of two thermistor (negative coefficient) bead sensing elements mounted in a probe housing. The resistance of each element varies inversely with any change in ambient temperature (Table 36-2). One sensing clement is thermally impeded by being enclosed in an insulated shield assembly. The housing is externally threaded for boss-mount- ing in an air duct and includes an electrical con- nector to facilitate connection to the temperature control system. Operation The thermally impended sensing element and the associated thermally open sensing ele- ment of the anticipator form two arms of a rate-of-change bridge circuit in the tempera- ture control system. The response of the ther- mally impended element to changing temperature lags the response of the thermally open element, and a signal is produced by the bridge circuit proportional to the rate of change in temperature. No adjustment or maintenance is required. Bench-check procedures are found in Main- tenance Manual Chapter/Section 36.10-0. PRECOOLER OUTLET TEMPERATURE SENSOR Description 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). FOR TRAINING PURPOSES ONLY 36-25 I 51 5; ig 71 EFTA01183167 as Figure 36.11. Precooler Fan Air Modulation Valve Fi ki llt P alifetY •wasen• Figure 36-10. Precooler Heat Exchanger z RELIEF VALVE I 'LTER A F O R TRAINING PURPOSES ONLY EFTA01183168 Figure 36-12. Precooler System Components MODULATION VALVE J ANTICIPATOR PRE iOO1. t A FlightSLifetY I Table 36-2. TEMPERATURE VS. RESISTANCE CHECK FOR TEMPERATURE SENSOR 1250 1200 5-1150 Ci 1100 ,i100 1000 G 950 900 390 395 TR, 400 405 TEMPERATURE (`F) 36-24 FOR TRAINING PURPOSES ONLY 410 NOTE When testing thennietats on bench the following should be notect 1 When measuring reeletance. enemy (Woe used all not slow sinter then BO micreempe to arm. Use of • Wheatstone &Sage wen this limitation the best method. 2. An accurate mango, determining lemoetature 'dawn to element eseentiel. 3. When checking 1n0000 of be web allow lagged thertniatot lo stabiles lot Nest 15 minutes belois mooting. firtielon 5 EFTA01183169 EFTA01183170