N506QS

Part: UPLOCK SWITCH — FAULTED (ZONE 700) · airframe 9,250 hrs · 6,095 cycles

JUST OUTSIDE THE FINAL APPROACH FIX WE PUT LANDING GEAR INTO THE DOWN POSITION AND RECEIVED THE GEAR DISAGREE RIGHT CAS MESSAGE. WE WENT AROUND AROUND, UTILIZED THE THE LANDING GEAR BLOW DOWN AS WELL AS THE LANDING GEAR HANDLE IN THE LAV PER THE QRH, GEAR DISAGREE RIGHT CAS MESSAGE REMAINED. REMOVED FAULTY RT WBA-MLG UPLOCK SWITCH, & REPLACED WITH CUSTOMER SUPPLIED NEW WBA-MLG UPLOCK SWITCH IAW MM 32-32-25.

Part: HOUSING — CORRODED (NLG WW) · airframe 9,059 hrs · 5,975 cycles

REPAIR CORROSION IN NLG HOUSING TUNNEL PER TEXTRON FIELD REPAIR FR-680A-0043-15554. REPAIRED CORROSION IN NLG HOUSING TUNNEL BY REPLACING PANELS PN: 7411212-3, 7411212-4, AND OVER-SIZING HOLE IN TOP SKIN 7411212-9 FROM A BJ4 FASTENER TO A BJ5 FASTENER IAW TEXTRON FIELD REPAIR - CORROSION, NLG HOUSING TUNNEL, MULTIPLE SITES, DRAWING NO. FR-680A-0043-15554, REV -, DATED 31 JUL 2025, SUPPORTED BY 8100-9, SUBMITTAL LETTER NO. 25-0003, DATED 11 AUG 2025. CESSNA LETTER REF: DQ49763M1, SUBJECT: NLG ACTUATOR HOUSING TUNNEL CORROSION, DATED SEPTEMBER 29, 2025.

Part: THRUST REVERSER — CORRODED (LEFT) · airframe 9,059 hrs · 5,975 cycles

DURING INSPECTION OF THE LH TR NOTED MULTIPLE SPOTS OF CORROSION ON THE INSIDE SIDES OF THE UPPER BUCKET. MECHANICALLY BLENDED 13 EA. AREAS OF CORROSION ON THE LH THRUST REVERSER UPPER DOOR, INBD AND OUTBD AREAS IAW CE680A SRM 51-10-01 AND SRM 51-70-03. AFTER NDT TESTING, DETERMINED BLENDED AREAS TO BE BEYOND LIMITATIONS OF 0.002 INCH OF MATERIAL LOSS FROM NOMINAL THICKNESS IAW CE680A SRM 51-70-03. COMPLIED WITH NETJETS ENGINEERING RFTS-114547 REV.0 TITLE: N506QS (680A-0043) LH UPPER TR DOOR CORROSION DATE: 01AUG25.

Part: FITTING — CORRODED (ZONE 200) · airframe 9,059 hrs · 5,975 cycles

WHILE PERFORMING TASK 57-10-00-222 FOUND THAT LH EMERGENCY BRAKE CARRY THROUGH CORRODED AROUND FITTING. DISCONNECTED EXISTING LT MLG EMERGENCY BRAKE PNEUMATIC LINE AND REMOVED EXISTING CARRY-THROUGH FITTING ON RIB LOCATED AT W.S. 37.00 FOR ACCESS. BLENDED 1 EA. AREA OF CORROSION ON LT WING RIB LOCATED AT W.S. 37.00 IN LH MLG WHEEL WELL IAW SRM 51-10-01 AND SRM 51-70-03. AFTER NDT TESTING, DETERMINED BLENDED AREA TO BE BEYOND SRM LIMITS OF 0.002 INCH OF MATERIAL LOSS FROM NOMINAL THICKNESS IAW SRM 51-70-03. COMPLIED WITH NETJETS ENGINEERING RFTS-114530 REV.0 REINSTALLED EXISTING LH MLG EMERGENCY BRAKE PNEUMATIC CARRY-THROUGH FITTING AND RECONNECTED PNEUMATIC LINE IN THE SAME LOCATIONS IAW SPM 20-10-05.

Part: STRUCTURE — CORRODED (ZONE 500) · airframe 9,059 hrs · 5,975 cycles

FOUND THAT LH EMERGENCY BRAKE CARRY THROUGH CORRODED AROUND FITTING ON RIB LOCATED AT W.S. 37.00. DISCONNECTED EXISTING LH MLG EMERGENCY BRAKE PNEUMATIC LINE AND REMOVED EXISTING CARRY-THROUGH FITTING ON RIB LOCATED AT W.S. 37.00 FOR ACCESS. MECHANICALLY BLENDED 1 EA. AREA OF CORROSION ON LH WING RIB LOCATED AT W.S. 37.00 IN LH MLG WHEEL WELL IAW CE680A SRM 51-10-01 AND SRM 51-70-03. AFTER NDT TESTING, DETERMINED BLENDED AREA TO BE BEYOND SRM LIMITS OF 0.002 INCH OF MATERIAL LOSS FROM NOMINAL THICKNESS IAW CE680A SRM 51-70-03. COMPLIED WITH NETJETS ENGINEERING RFTS-114530 REV.0 TITLE: N506QS (680A-0043) LH WING RIB WEB CORROSION DATE: 30JUL25. REINSTALLED EXISTING LH MLG EMERGENCY BRAKE PNEUMATIC CARRY-THROUGH FITTING AND RECONNECTED PNEUMATIC LINE IN THE SAME LOCATIONS IAW CE680A SPM 20-10-05.

Part: THRUST REVERSER — FAULTED (ZONE 400) · airframe 9,059 hrs · 5,975 cycles

DURING INSPECTION OF THE LH TR NOTED MULTIPLE SPOTS OF CORROSION ON THE INSIDE SIDES OF THE UPPER BUCKET. MECHANICALLY BLENDED 13 EA. AREAS OF CORROSION ON THE LH THRUST REVERSER UPPER DOOR, INBD AND OUTBD AREAS IAW CE680A SRM 51-10-01 AND SRM 51-70-03. AFTER NDT TESTING, DETERMINED BLENDED AREAS TO BE BEYOND LIMITATIONS OF 0.002 INCH OF MATERIAL LOSS FROM NOMINAL THICKNESS IAW CE680A SRM 51-70-03. COMPLIED WITH NETJETS ENGINEERING RFTS-114547 REV.0

Part: UPLOCK SWITCH — DAMAGED (ZONE 700) · airframe 8,917 hrs · 5,875 cycles

MLG: BLEW GEAR DOWN USING THE GEAR BLOWDOWN LOCATED IN THE FRONT. NO CHANGE IN GEAR INDICATION. HAD TO PULL THE MAIN GEAR LEVER IN THE BACK AS WELL. NO CHANGE IN GEAR INDICATION. DECLARED EMERGENCY. LOW FLY BY THEN LANDED. CORRECTIVE ACTION; REPLACED LH MLG UPLOCK SWITCH IAW 680A MM 32-32-25. OPS CHECK GOOD.

Part: LIGHT — MALFUNCTIONED (ZONE 200) · airframe 8,356 hrs · 5,546 cycles

FLOOR EMERG EXIT LIGHT: UNDER SEAT 5, EMER LIGHT DOES NOT ILLUMINATE WHEN LIGHT SWITCH IS IN THE ON POSITION. CORRECTIVE ACTION; REPLACED FLOOR EMERGENCY LIGHT. OPS CHECK GOOD AT THIS TIME. ALL WORK ACCOMPLISHED IAW CE-680AS AMM 33-50-00,

Part: LIGHT — FOD (ZONE 200) · airframe 8,271 hrs · 5,484 cycles

LAV EMERG LIGHT: LAVATORY EMERGENCY LIGHTING LOCATED AT THE TOE KICK, IS INOPERATIVE. CORRECTIVE ACTION; FOUND DEBRIS BUILD UP IN PLUG FOR EMERGENCY TOE KICK LIGHT. CLEANED DEBRIS OUT. EMERGENCY LIGHT OPERATES AS INTENDED.

Part: UNKNOWN — UNKNOWN (UNKNOWN) · airframe 6,350 hrs · 4,220 cycles

GROUND CREW REPORTED EMERGENCY LIGHT REMAINED ON AFTER AIRCRAFT WAS POWERED DOWN. ///SIGN-OFF/// FOUND G SWITCH TRIPPED ON #1 EMERGENCY BATTERY, RESET G SWITCH, LIGHTS WENT OUT, CHARGED BATTERY FOR 2 HOURS, PERFORMED EMERGENCY LIGHTING ADJUSTMENT TEST I.A.W CE-680A AMM 33-50-00, OPS CHECK SATISFACTORY.

Part: NONE — NONE · airframe 6,513 hrs · 4,307 cycles

MAIN DOOR: AMBER CABIN DOOR OPEN CAS ILLUMINATED ON TAKEOFF WHICH CAUSED A NO TAKEOFF WARNING. REJECTED THE TAKEOFF. ACCOMPLISHED THE CABIN DOOR OPEN PROCEDURE. FOUND THE RED CABIN DOOR HANDLE RELEASE BUTTON VERY LOOSE IN ITS HOUSING WHICH IS CAUSING THE AMBER DOOR OPEN ANNUNCIATOR AND THE AMBER CABIN DOOR OPEN CAS MESSAGE TO ILLUMINATE. // SIGNOFF// TIGHTENED JAM NUT FOR INNER HANDLE PUSHBUTTON SWITCH IAW MODEL 680A 52-70-20. OPS CHECK GOOD NO DEFECTS NOTED.

Part: NONE — NONE · airframe 6,014 hrs · 3,977 cycles

EMERG EXIT SIGN/LIGHT: FORWARD - MAIN CABIN DOOR EXIT SIGN INOP. ALL OTHER LIGHTS ILLUMINATE WITH THE EMER LTS ARM SWITCH IN ON.

Part: BATTERY PACK — INOPERATIVE · airframe 5,815 hrs · 3,840 cycles

MAIN EXIT SIGN/LIGHT: WHITE AND RED EMERGENCY EXIT SIGN OVER MAIN CABIN DOOR IS NOT ILLUMINATING WITH EMERGENCY LIGHT TEST. REPEAT WRITE UP. ON SHIPS POWER THE EXIT SIGN LIGHT STARTS TO SLOWLY ILLUMINATE. BATTERY PACK FOR THAT EXIT SIGN IS NOT HOLDING A CHARGE. "CORRECTIVE ACTION" REMOVED PEDESTAL SIDE PANEL AND FLOOR BOARD TO GAIN ACCESS BATTERY. REMOVED AND REPLACED #1 EMER BATTERY PACK, OPS CHECK GOOD. REINSTALLED PEDESTAL PANELS AND FLOOR BOARD. REF CE-680A AMM 33-50-06. P/N OFF CBS28-1 S/N OFF 006359 P/N ON CBS28-1 S/N ON 007604

Part: NONE — NONE · airframe 5,710 hrs · 3,783 cycles

CABIN EMERG LIGHT: WHITE AND RED EMERGENCY EXIT SIGN OVER MAN CABIN DOOR IS INOPERATIVE. (ALL OTHER EMER LIGHTS ARE OPERATIVE.)

Part: STRINGER — CORRODED · airframe 5,700 hrs · 3,777 cycles

FOUND RH TAILCONE STRINGER CORRODED BEYOND REPAIR, REPLACED WITH NEW TEXTRON P/N 6912640-24 REFERENCING CESSNA 680A SRM 51-40-05 AND SRM 51-40-13.

Part: STRINGER — CORRODED · airframe 5,700 hrs · 3,777 cycles

BLENDED AND TREATED CORRODED TAILCONE APU STINGER LH SIDE SKIN PER TEXTRON REPAIR MEMO.

Part: ANGLE — CORRODED · airframe 5,700 hrs · 3,777 cycles

FOUND THE EXISTING LH AND RH TAILCONE STINGER RUDDER FAIRING ATTACHMENT ANGLES CORRODED BEYOND REPAIR, REPLACED WITH NEW TEXTRON P/N 6912630-67 AND P/N 6912630-68 REFERENCING CESSNA 680A SRM 51-40-05 AND SRM 51-40-13.

Part: STRINGER — CORRODED · airframe 5,700 hrs · 3,777 cycles

FOUND THE RH SIDE SKIN OF THE TAILCONE STINGER CORRODED BEYOND REPAIR, REPLACED WITH NEW RH SIDE SKIN TEXTRON P/N 6912640-24 REFERENCING CESSNA 680A SRM 51-40-05 AND SRM 51-40-13.

Part: NONE — NONE · airframe 5,597 hrs · 3,699 cycles

MAIN EXIT SIGN/LIGHT: MAIN EXIT SIGN LIGHT, BOTH FLOOR EXIT SIGN LIGHTS ADJACENT TO THE MAIN DOOR, AND EMERGENCY EXIT LIGHT UNDER SEAT 10 ALL WILL NOT EXTINGUISH. // SIGNOFF// ON ENTRY OF AIRCRAFT FOUND FWD EMERGENCY LIGHTS ILLUMINATED. ALL THESE UGHTS ARE POWERED FROM #1 EMERGENCY BATTERY, REMOVED R/H CENTER PEDESTAL PANEL TO GAIN ACCESS TO #1 EMERGENCY LIGHT G SWITCH. RESET INERTIA SWITCH AND LIGHTS WENT OUT IMMEDLATELY, PERFORMED OPERATIONAL CHECK OF EMERGENCY LIGHTING SYSTEM. OPS CHECK GOOD. ALL WORK PERFORMED IAW CESSNA 680A AMM 33-50-00. NO DEFECTS NOTED AT THIS TIME.

Part: NOT REPORTED — NOT REPORTED · airframe 5,478 hrs · 3,624 cycles

CABIN EMERG LIGHT: NO FORWARD CABIN EMERGENCY LIGHTING. BATTERIES CONNECTED EMER LIGHT SWITCH TO ON, FORWARD CABIN EMERGENCY LIGHTING FAILED TO ILLUMINATE.// CORRECTIVE ACTION// COMPLETED TC-FLT-33-1001 (CESSNA 680/680A/700/ EMBRAER EMERGENCY LIGHTING POWER SUPPLY BATTERY EXERCISE PROCEDURE). EMER BATTERIES WERE RECHARGES AND PASSED OPS CHECK. NO FURTHER DEFECTS NOTED.

Part: NONE — NONE · airframe 5,294 hrs · 3,502 cycles

EMERGENCY LIGHTING: EMER LIGHTS WILL NOT COME ON WHEN EMER LIGHT SWITCH SELECTED TO ARM WITHOUT MAIN DC POWER AVAILABLE. DURING PREFLIGHT, I SELECTED EMR LIGHT SWITCH TO ARM WITH OUT BATTERIES ON AS PER SOPS. NORMALLY, THE EMER LIGHTS SHOULD COME ON WITH SWITCH IN ARM BUT BATTERIES OFF. IN THIS CASE, THE EMER LIGHTS DID NOT COME ON WITH EMER LIGHT SWITCH IN ARM BUT BATTERIES OFF. I CHECKED EACH INDIVIDUAL EMER LIGHT IN THE SYSTEM, AND NONE WERE ON. THE EMER LIGHTS WOULD COME ON WHEN THE EMER LIGHT SWITCH WAS SELECTED TO ON. // SIGNOFF // CHARGED EMERGENCY BATTERIES AND OPERATIONAL TEST CARRIED OUT, OPS TEST GOOD. REF MODEL 680A AMM 33-50-00

Part: SWITCH — FAILED (PAX DOOR) · airframe 4,721 hrs · 3,101 cycles

MAIN DOOR HANDLE: MAIN CABIN DOOR WILL NOT OPEN FROM INSIDE. RED MICRO-SWITCH BUTTON ON DOOR HANDLE IS DEAD. DOOR CLOSES PROPERLY AND OPENS NORMALLY FROM OUTSIDE.///SIGN-OFF///REPAIRED WIRING PER CITATION SPM 20-30-15. OPERATED MED PER MM 52-70-00. OPS CHECK GOOD.

Part: CIRCUIT BOARD — DEFECTIVE (MAIN DOOR) · airframe 4,536 hrs · 2,987 cycles

MAIN DOOR: DOOR WILL NOT CLOSE FROM INSIDE EVEN WITH CHECKLIST BYPASS PROCEDURE. CLOSED WITH EXTERIOR BYPASS //SIGN OFF // REMOVED INOP CED PCB AND INSTALLED NEW CONDITION CED PCB IAW CE680A AMM 24-60-04. REMOVED MED THRESHOLD WIRING HARNESS AND INSTALLED NEW CONDITION MED THRESHOLD WIRING HARNESS JAW CE680A AMM 52-10-00. PERFORMED OPS AND FUNCTIONAL TEST. OPS AND FUNCTIONAL TEST GOOD WITH NO DEFECTS NOTED.

Part: CAP — ERODED (RT STAB) · airframe 3,551 hrs · 2,359 cycles

RIGHT STABILIZER TIP CAP EROSION. ACCOMPLISHED ENGINEERING MEMO DQ24425RRL1 REV A DATED JANUARY 21, 2020; 680A-0043, N506QS, RIGHT STABILIZER TIP CAP EROSION.

Part: VALVE — FAULTY (NLG DOOR) · airframe 7,466 hrs · 2,609 cycles

NOSE LANDING GEAR DID NOT EXTEND NORMALLY AFTER GEAR WAS SELECTED DOWN, AFTER ABOUT 45 SECONDS GEAR EXTENDED NORMALLY, FOUND NOSE LANDING GEAR DOOR CONTROL VALVE AT FAULT.

Part: TILLER — UNKNOWN (NLG STEERING) · airframe 6,989 hrs · 2,454 cycles

NOSE STEERING INOPERATIVE.

Part: RIB — DAMAGED (STABILIZER) · airframe 4,926 hrs · 1,733 cycles

ON POST FLIGHT DAMAGE NOTED TO FAIRING ON OUTSIDE PORTION OF RIGHT STABILIZER LOWER SURFACE.

Part: RIB — DAMAGED (STABILIZER) · airframe 4,926 hrs · 1,733 cycles

ON POST FLIGHT DAMAGE NOTED TO FAIRING ON OUTSIDE PORTION OF RT STABILIZER LOWER SURFACE.

Part: ACTUATOR — FAILED (HORIZ STAB) · airframe 3,812 hrs · 1,379 cycles

AFTER LANDING, SELECTED FLAPS TO UP BUT DID NOT MOVE. FLAP / STAB FAIL MESSAGE, FLAP / STAB IND INOP MESSAGE.

Part: ACTUATOR — MALFUNCTIONED (ZONE 300) · airframe 3,812 hrs · 1,379 cycles

AFTER LANDING, SELECTED FLAPS TO UP BUT DID NOT MOVE. FLAP/STAB FAIL MESSAGE, FLAP/STAB IND INOP MESSAGE.