It was constructed without engines or a functional heat shield. He feared the chunks were pieces of his heat shield that might be disintegrating. The CL exhaust pipe and heat shield were chrome. At its maximum, the temperature of the heat shield was between . The tension ties were stainless steel straps bolted to the CM's aft heat shield. PICA-X is ten times less expensive to manufacture than the NASA PICA heat shield material. Next to the heat shield was the pressurized crew compartment (3). The payload separated internally, but got stuck within the heat shield. The crew tunnel in the Gemini B heat shield connected it to the spacecraft. The aeroshell was made of two main parts&colon; a heat shield and a backshell. This heat shield was composed of phenolic formaldehyde resin. Later in the flight, telemetry indicated that the heat shield had loosened. The propulsion section consists of the rocket motor, external heat shield, and two external conduits. These flights validated the service module engine and the command module heat shield. Should a heat shield be used, it would need to be very large.