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With all cockpit indications normal the reporter and his first officer determined on taxi out there was no response to brake applications by either the captain or first officer. The parking brake was used to gain braking response.
| Attributes | |
| ACN | 333704 |
| Time | |
| Date | 199604 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | ATR 42 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | ground other : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 250 flight time total : 5000 flight time type : 2800 |
| ASRS Report | 333704 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other other : unspecified cockpit |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Taxiway dry, daylight. Antiskid test ok and hydraulic fluid level ok on preflight. Aircraft was started, after-start checklist complete. Began taxi. Taxi checklist initiated. Captain tested toe brakes -- ok. Captain tested parking brake -- ok. First officer tested toe brakes -- ok. AC wild normal. Hydraulic normal. No single chime, master caution or any warning. Captain applied toe brakes during slow speed taxi. Pedals traveled to the floor with no effect. He asked me to apply mine. Same, no effect with full pedal travel to floor. Captain applied parking brake which did stop the aircraft. Ran QRH. Contacted moc. Returned to the gate using parking brake as necessary. 2 attempts using toe brakes on way back to gate unsuccessful.
Original NASA ASRS Text
Title: WITH ALL COCKPIT INDICATIONS NORMAL THE RPTR AND HIS FO DETERMINED ON TAXI OUT THERE WAS NO RESPONSE TO BRAKE APPLICATIONS BY EITHER THE CAPT OR FO. THE PARKING BRAKE WAS USED TO GAIN BRAKING RESPONSE.
Narrative: TXWY DRY, DAYLIGHT. ANTISKID TEST OK AND HYD FLUID LEVEL OK ON PREFLT. ACFT WAS STARTED, AFTER-START CHKLIST COMPLETE. BEGAN TAXI. TAXI CHKLIST INITIATED. CAPT TESTED TOE BRAKES -- OK. CAPT TESTED PARKING BRAKE -- OK. FO TESTED TOE BRAKES -- OK. AC WILD NORMAL. HYD NORMAL. NO SINGLE CHIME, MASTER CAUTION OR ANY WARNING. CAPT APPLIED TOE BRAKES DURING SLOW SPD TAXI. PEDALS TRAVELED TO THE FLOOR WITH NO EFFECT. HE ASKED ME TO APPLY MINE. SAME, NO EFFECT WITH FULL PEDAL TRAVEL TO FLOOR. CAPT APPLIED PARKING BRAKE WHICH DID STOP THE ACFT. RAN QRH. CONTACTED MOC. RETURNED TO THE GATE USING PARKING BRAKE AS NECESSARY. 2 ATTEMPTS USING TOE BRAKES ON WAY BACK TO GATE UNSUCCESSFUL.
Data retrieved from NASA's ASRS site as of July 2007 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.