SDR CA020312003

Service difficulty report · Skin · Bolkms BK117A4

Difficulty date: February 22, 2002
Submitted: March 21, 2002
Operation: General aviation
Make and model: Bolkms BK117A4
Engine: Lyc LTS101650B1
System (JASC): 5412 · Nacelle/Pylon, Bulkhead/Firewall
Part: Skin
Condition: Cracked
Location: Firewall
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) - FIREWALL ASSEMBLY AFT LT.- STA 5896, WL 2830, BL 430 AND WL 2740, BL570.- FIREWALL IS MADE OF 0.016" TITANIUM THROUGH WHICH BOTH THE FIRE EXTINGUISHER AND AIR CONDITIONER TUBING ASSEMBLY FITTINGS PASS. - CRACKS FORM AROUND FITTING HOLES IN TITANIUM. - SUSPECT CRACKS FORM DUE TO EXTREME VIBRATION AS HELICOPTER PASSES THRU TRANSLATIONAL LIFT. FITTINGS ARE RIGID - FIREWALL VIBRATES.