As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LANDING GEAR DID NOT EXTEND WHEN HANDLE WAS PLACED IN DOWN POSITION. USED ALTERNATE GEAR EXTENSION SUCCESSFULLY. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED SAFELY AT ORD WHERE IT WAS TOWED TO THE GATE. **SUPPLEMENTAL REPORT FOR AALA202206174510: MAINTENANCE FOUND SAFETY VALVE FAULTING AND REPLACED IT PER AMM 32-31-17. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.** (CLOSED)