A B757-222 previously deferred rh recirc fan was replaced. Fan still inoperative. Afterward; waterli...

Attributes
ACN	730212
Time
Date	200703
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 2
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 24
ASRS Report	730212
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Resolutory Action	none taken : anomaly accepted
Consequence	other
Factors
Maintenance	contributing factor : briefing
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Right-hand recirculation fan was written up inoperative on air carrier X and deferred to ZZZ on mar/tue/07. Checked history and service bulletin and replaced fan per maintenance manual 21-25-00. During operations check of system fan remained inoperative. Checked east&east compartment and found circuit breaker popped on r-hand recirculation fan and noted forward waterline heater popped. Informed lead of situation. Replaced relay (K416) no help. Later that night noticed 3 each more breakers popped forward pit lights; forward cargo loader drive and forward cargo loader control. Reset forward cargo lights; could not reset either of the cargo loader breakers. To my knowledge all items were deferred and aircraft was released. Callback conversation with reporter revealed the following information: reporter states he and another mechanic were quite concerned about the additional circuit breakers popping after they had replaced the rh recirc fan. With so many electrical issues showing up; someone suggested to this reporter to file an ASRS report.

Original NASA ASRS Text

Title: A B757-222 PREVIOUSLY DEFERRED RH RECIRC FAN WAS REPLACED. FAN STILL INOP. AFTERWARD; WATERLINE HEATER; FWD CARGO PIT LOADER DRIVE AND CONTROL CIRCUIT BREAKERS POPPED.

Narrative: R-HAND RECIRCULATION FAN WAS WRITTEN UP INOP ON ACR X AND DEFERRED TO ZZZ ON MAR/TUE/07. CHKED HISTORY AND SVC BULLETIN AND REPLACED FAN PER MAINT MANUAL 21-25-00. DURING OPS CHK OF SYS FAN REMAINED INOP. CHKED E&E COMPARTMENT AND FOUND CIRCUIT BREAKER POPPED ON R-HAND RECIRCULATION FAN AND NOTED FORWARD WATERLINE HEATER POPPED. INFORMED LEAD OF SIT. REPLACED RELAY (K416) NO HELP. LATER THAT NIGHT NOTICED 3 EACH MORE BREAKERS POPPED FORWARD PIT LIGHTS; FORWARD CARGO LOADER DRIVE AND FORWARD CARGO LOADER CTL. RESET FORWARD CARGO LIGHTS; COULD NOT RESET EITHER OF THE CARGO LOADER BREAKERS. TO MY KNOWLEDGE ALL ITEMS WERE DEFERRED AND ACFT WAS RELEASED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HE AND ANOTHER MECHANIC WERE QUITE CONCERNED ABOUT THE ADDITIONAL CIRCUIT BREAKERS POPPING AFTER THEY HAD REPLACED THE RH RECIRC FAN. WITH SO MANY ELECTRICAL ISSUES SHOWING UP; SOMEONE SUGGESTED TO THIS REPORTER TO FILE AN ASRS RPT.

Data retrieved from NASA's ASRS site as of January 2009 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.

A B757-222 previously deferred rh recirc fan was replaced. Fan still inoperative. Afterward; waterline heater; fwd cargo pit loader drive and control circuit breakers popped.