What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Received informal incident report from the Van Nuys air traffic control tower on 01/09/01. Report stated that lapd helicopter PD16 (at approximately 19:17), advised the tower that they had a burning smell in the cockpit. They declared an emergency and landed immediately at the city heliport. The landing was uneventful. The helicopter had 80 percent fuel on board and four passengers. On 01/12/2001 I discussed the matter with the chief of maintenance for the city of los angeles. He stated that shortly after takeoff the flight crew smelled burning rubber and landed. The maintenance crew found that the main rotor transmission input seal had started to leak and fluid leaked onto the air conditioning compressor drive belt that caused it to slip. After which it began to burn from contact with the drive pulley. The maintenance crew changed the input seal on the transmission and replaced the air conditioning drive belt and returned the helicopter to service.
As the FAA filed it
(-23) RECEIVED INFORMAL INCIDENT REPORT FROM THE VAN NUYS AIR TRAFFIC CONTROL TOWER ON 01/09/01. REPORT STATED THAT LAPD HELICOPTER PD16 (AT APPROXIMATELY 19:17), ADVISED THE TOWER THAT THEY HAD A BURNING SMELL IN THE COCKPIT. THEY DECLARED AN EMERGENCY AND LANDED IMMEDIATELY AT THE CITY HELIPORT. THE LANDING WAS UNEVENTFUL. THE HELICOPTER HAD 80 PERCENT FUEL ON BOARD AND FOUR PASSENGERS. ON 01/12/2001 I DISCUSSED THE MATTER WITH THE CHIEF OF MAINTENANCE FOR THE CITY OF LOS ANGELES. HE STATED THAT SHORTLY AFTER TAKEOFF THE FLIGHT CREW SMELLED BURNING RUBBER AND LANDED. THE MAINTENANCE CREW FOUND THAT THE MAIN ROTOR TRANSMISSION INPUT SEAL HAD STARTED TO LEAK AND FLUID LEAKED ONTO THE AIR CONDITIONING COMPRESSOR DRIVE BELT THAT CAUSED IT TO SLIP. AFTER WHICH IT BEGAN TO BURN FROM CONTACT WITH THE DRIVE PULLEY. THE MAINTENANCE CREW CHANGED THE INPUT SEAL ON THE TRANSMISSION AND REPLACED THE AIR CONDITIONING DRIVE BELT AND RETURNED THE HELICOPTER TO SERVICE.