N79TS
Registered owner: TASAIR LLC, WI (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
| Operator | Role | Period | Basis |
|---|---|---|---|
| SC AVIATION, INC. (G13A) | Certificate holder | — | Matched by certificate designator |
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
Maintenance disclosures
LOST AIRSPEED INDICATOR DURING DESCENT IN EXCESSIVE/SEVERE ICING. ALSO RECEIVING A PITOT/VANE HEAT FAILURE ANNUNCIATOR LIGHT. PERFORMED VISUAL INSPECTION OF PILOTS/COPILOT'S PITOT/STATIC PROBES. PERFORMED TEST OF PILOT/COPILOT PITOT PROBE AND STATIC PLATE HEAT. PERFORMED OPERATIONAL TEST OF #1/#2 ADC. PERFORMED LEAK TESTING OF PILOTS/COPILOT'S PITOT SYSTEM AND FOUND LEAK RATE WITHIN LIMITS. PERFORMED DRAINING OF PITOT/STATIC LINES FROM AIRCRAFT KEEL. ALL TESTING PERFORMED WITH NO DISCREPANCIES NOTED IAW AMM 34-10-05 AND 34-11-19.
I AM FILLING THIS SDR OUT DUE TO A TREND THAT WE HAVE NOTICED IN OUR FLEET OF 12 HAWKER 125 SERIES AIRCRAFT. WE HAVE HAD A FEW CASES OF BRAKES THAT HAVE LOCKED UP DURING AIRCRAFT TOWING. THIS HAS OCCURRED WHILE THE AIRCRAFT WAS PUSHED BACKWARDS. ONCE THE ISSUE WAS RECOGNIZED AND DETERMINED NOT TO BE AN ISOLATED EVENT WE STARTED GATHERING DATA. THE CONCLUSION OF THE DATA THE WE COLLECTED IS POINTING TO AN ISSUE WITH THE RAPCO HEAT PACKS P/N RFS1897K. WHAT WE HAVE FOUND IS THAT PRIOR TO THE BRAKES REACHING THE MAXIMUM WEAR INDICATION THE FRICTION PADS WILL FAIL. THIS CAUSES THE FRICTION BACKING TO CURL AND EXPAND THE BRAKE CAUSING THE TIRE TO LOCK UP. THE AHA1897 BRAKE HAS A WEAR INDICATOR PIN THAT PROTRUDES THRU A BOSS TO INDICATE WEAR. UNFORTUNATELY, ONCE THE BRAKE FAILS THERE IS NO WAY TO GET AN ACCURATE READ OF THIS PIN OR EVEN A MEASUREMENT AS THE PRESSURE PLATE IS DISPLACED ONCE THE BRAKE FAILS. WE ARE IN THE PROSSES OF MEASURING AND INSPECTING ALL BRAKES IN OUR FLEET. DURING THIS INSPECTION WE ARE REMOVING THE TIRES AND INSPECTING THE PAD WEAR VISUALLY IF DIMENSION X LISTED IN THE HAWKER 800A MM 32-40-114 FIG 604 IS MORE THAT 1.8â. IT IS IMPORTANT TO NOTE THAT OUR AIRCRAFT DO HAVE THE WEAR PINS CHECKED EVERY TIME THAT THE AIRCRAFT IS BACK AT HOME BASE UNDER NORMAL OPERATION. UPON DOING OUR INSPECTION ON ONE OF OUR AIRCRAFT N79TS IT WAS FOUND THAT THE #1 BRAKE WAS STARTING TO CURL. THIS BRAKE S/N NU313 HAD CSO: 1408 AND THE WEAR PIN WAS SHOWING APPROXIMATELY .20â OF LIFE LEFT. THE #2 BRAKE WAS ALSO INSPECTED IT TOO SHOWED APPROX. .20â OF LIFE LEFT AND HAD CSO: 1408. OUT OF THE 35 BRAKES THAT WE HAVE INSPECTED AND RECORDED MEASUREMENTS WE HAVE 5 THAT WE HAVE CHANGED DUE TO THE FRICTION BACKINGS APPEARING TO SHOW SIGNS OF CURLING OF THOSE BRAKES THE CLOSEST PIN SHOWS .125â OF LIFE LEFT.
THIS IS A FOLLOW ON TO SDR G13A120420181. THIS BRAKE IS IN ABOUT TO HAVE A FAILURE PLEASE SEE ATTACHED PHOTS SHOWING THE UNUSUAL WEAR AND THE AMOUNT OF BRAKE WEAR PIN STILL SHOWING. THIS IS SHOWING APPROXIMATELY .2". REFERENCE THE SDR G13A120420181 FOR FULL DESCRIPTION OF THE ISSUE WE ARE OBSERVING. PLEASE ALSO NOT THAT WE HAVE HAD 1 AIRCRAFT IN OUR FLEET RECENTLY THAT THE BRAKES WENT TO FULL LIFE WITH NO UNUSUAL WEAR AND THOSE BRAKES HAD THE OEM AH089881 HEAT PACKS INSTALLED.